Question

Find the value of $x$ so that the given four numbers are in proportion.

$10,36,5andx$

Answer 1

We know that if four numbers $a,b,candd$are in proportion.

then $a\times d=b\times c$ …………………………….$eq\left(1\right)$

so, here in $10,36,5andx$

$a=10,b=36,c=5,d=x$

the by $eq\left(1\right)$ we have,

$$\begin{gathered} \Rightarrow 10\times x=36\times 5 \\ \Rightarrow 10x=180 \\ \Rightarrow x=\frac{180}{10} \\ \Rightarrow x=18 \end{gathered}$$

Hence the value of $x=18$ for which the given four numbers $10,36,5andx$ are in proportions.