Question

The first, third and fourth terms of a proportion are $7,28\&68$ respectively. Find the second term.

Answer 1

Let the second term be $x$

then proportion will be$=7:x::28:68$

$$\begin{gathered} 28x=7\times 68 \\ x=\frac{7\times 68}{28} \\ x=\frac{68}{4} \\ x=17 \end{gathered}$$

Hence second term will be $17$