Question

If 25,x,2x,72 are in proportion what is value of x

Answer 1

25,x,2x and 72 are in proportion.

So
25 : x = 2x : 72
=> 25/x = 2x/72
=>2x^2 = 25 × 72
=>2x^2 = 1800
=> x^2 = 1800/2
=>x^2 = 900
•°• x = 30