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If $4:5 =2:x$, then find the value of $x$.
Given: $4:5 =2:x$.
To do: To find the value of $x$.
Solution:
As given, $4:5 =2:x$
$\Rightarrow \frac{4}{5}=\frac{2}{x}$
$\Rightarrow 4\times x=2\times5$ [On cross multiplication]
$\Rightarrow 4x=10$
$\Rightarrow x=\frac{10}{4}$
$\Rightarrow x=2.5$
Therefore, $x=2.5$
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