Question

The first, second, and fourth terms of a proportion are 6,18, and 75 respectively. Find its third term.

Answer 1

Let the third term = x

$6:18\colon\colon x:75$

$=18\times x=6\times 75$

$x=\frac{6\times 75}{18}=\frac{75}{3}=25$

The third term of proportion is 25