Question

Find the value of $x$ in the following, if the given number is in proportion.

40, 120, 60 and $x$

Answer 1

Find the value of $x$:

Given 40, 120, 60 and $x$ are in proportion.

So, $40:120::60:x$

$$\begin{gathered} \Rightarrow \frac{40}{120}=\frac{60}{x} \\ \Rightarrow 40x=120\times 60 \\ \Rightarrow x=\frac{120\times 60}{40} \\ \Rightarrow x=180 \end{gathered}$$

Hence, the value of $x$ is $180$.