Question

Find the value of $x$ if $7,x,9,72$are in proportion.

Answer 1

Sine , the ratios are in proportion , so

$$\begin{gathered} \Rightarrow \frac{7}{x}=\frac{9}{72} \\ \Rightarrow \frac{7}{x}=\frac{1}{8} \\ \Rightarrow 7\times 8=x\times 1(CrossMultiply) \\ \Rightarrow 56=x \end{gathered}$$

So, the value of $x$ is $56.$