Question

First, second and fourth terms of a proportion are respectively 5.2, 3.9 and 3. Find its third term.​

Answer 1

Let 5.2 : 3.9 :: x : 3

$\mathtt{ \frac{5.2}{3.9} = \frac{x}{3} } \\ \\ \mathtt{x = 3 \times \frac{5.2}{3.9} } \\ \\ \mathtt{x = 4 \: ans}$