Question

find the fourth proportion of 9 ,16,25

Answer 1

9:16::25:x
so, we find the value of x.

= x = 16×25/9
x = 400/9

Answer 2

9:16::25:x 
so, we find the value of x.

= x = 16×25/9
= x = 400/9
= x = 44.4444444444