The fourth proportional to 4, a, and 16a is 81. What is the value of a?

The third proportion of 0.024 and 0.12 is:

The ratio of the third proportional to 16 & 40 and the mean proportional between 10 & 40 is:

If 2³ : 8^5.06 :: 8^-4.06 : x, find the value of x.

Find the mean proportion of \(\frac{a^3+b^3}{a-b} and \frac{a^2-b^2}{a^2-ab+b^2}\).

Find the fourth proportional to 3, 12, 14.

The fourth proportional to 3, 5, 9 is:

The third proportional to 24 and 36 is:

Find the mean proportional between 4 and 900.

If a + b = 25 and a – b = 7, then determine the mean proportion of a and b.

The mean proportion of 169 and 144 is:

If x is the mean proportional between 12.8 and 64.8, then the value of x is:

M varies inversely as (N² + 3). If M = 3 when N = 3, then what will be the value of M when N² = 69?

What is the ratio of the mean proportional between 1.6 and 3.6 and the third proportional of 5 and 8?

Find the mean proportion of 3 and 27. 

A varies directly as the positive square root of B, and inversely as the cube of C. If A = 15, when B = 27 and C = 2, then find B when A = 9 and C = 2.

What is the ratio of the fourth proportional of 2, 5, 6 to the fourth proportional of 6, 8, 9?

Find the mean proportional between 0.64 and 0.81.

The third proportional to 81 and 27 is:

Which smallest positive number should be subtracted from each of 9 and 13 so that 18 is the third proportion to them?

 Find the third proportional to 8 and 12.

Find the fourth proportional to 7, 13 and 21.

The third proportional of 42 and 63 is:

The weight of a liquid varies directly with its volume. A liquid that weighs 12 kg has a volume of 3 liters. What will be the weight of a liquid that has a volume of 4 liters?

What is the fourth proportional to 16, 24, 8?

Find the fourth proportional to 5, 10, and 12.

If a : b = 2 : 7 and 343 is the third proportional to a and b, then the value of b – a is:

In proportion, the product of the 1st and 4th term is 70 and that of the 2nd and 3rd term is 3.5x. Find the value of x.

Find the mean proportional of (x + y)⁴ and (x - y)⁴.

Find the fourth proportional to the numbers 36, 48, and 90.

If x is directly proportional to y and x = 10 when y = 8, then what is the value of x when y = 36?

The fourth ratio of 12, 24, and 27 is the same as the third ratio of A and 36. What is the value of A?

Find the mean proportion between 256 and 484.

Find the third proportional to 27 and 18.

Find the mean proportion between \({(6+\sqrt8)}\) and \({(3-\sqrt2)}\).

Find the mean proportional between 18 and 32. 

The mean proportional between 0.04 and 0.36 is:

The fourth proportional to the numbers 5, 6, and 8 is:

Find the mean proportional between 9 and 25.

Find the fourth proportional of s³, s²t, and st².

Find the third proportion to 16 and 24.

The ratio between the fourth proportional of 7, 5, and 3 to the third proportional of 7 and 13 is:

Find the mean proportional between 3 and 27.

If 3 : 5 = x : 75, then what is the value of x?

If x is the fourth proportional of 48, 72 and 108, what is the value of x?

What is the fourth proportional to √6, √8, and √21?

The mean proportional of a and b is c. What is the mean proportional of a² c and b² c?

The ratio of the third proportion of 5 and 12 with the fourth proportion of 5, 8, and 9 is:

What is the third proportion to 15 and 24?

Find the mean proportional of 0.75 and 3.