Question

Find the value of $x$, if the following is in proportion: $4,10,42andx$.

Answer 1

Find the value of $x$:

Since $4,10,42andx$ are in proportion,

$4:10::42:x$

$\Rightarrow \frac{4}{10}=\frac{42}{x}$

$\Rightarrow 4\times x=42\times 10$

$\Rightarrow x=\frac{42\times 10}{4}$

$\Rightarrow x=105$

Hence, the value of $x$ is $105.$