Question

the fourth proportional to 7, 7,64 is ?? ​

Answer 1

Answer:

let the fourth number = x

7, 7, 64, x

product of extremes = Product of means

7 × x = 7 × 64

7x = 448

x = 448/7

x = 64

Hence the fourth proportional to 7, 7, 64 is 64

Answer 2

From the given question the correct answer is :

the fourth proportional to 7, 7, 64 is 64

Given:

7,7,64

To find :

the fourth proportional

Solution:

Let the fourth proportional to the numbers 7, 7, and 64 be x.

Now,

7: 7 :: 64 : x or

in terms of the fractions we can write:

product of extremes = Product of means

7x = 7 × 64.

x = {7 × 64}/7

= 64

Hence the fourth proportional to 7, 7, 64 is 64