If 100 : 250 : : 250 : x, then what is the value of x?

Correct option is D

Given:

100:250::250:x

Formula Used:

If 4 numbers a,b,c and d are in proportional then:

a:b::c:d and $$a \times d = b \times c$$​

​$$d = \frac{b\times c}{a}$$​​

Solution:

100:250::250:x

​$$x = \frac{250\times 250}{100} =625$$​​