Check whether the given are in proportion?
$5, 10, 20, 40$

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Solution

We have
$5, 10, 20, 40$
$\begin{array}{rcl} 5 : 10 & = & 20 : 40 \\ 5 : 10 & = & 1 : 2 \\ 20 : 40 & = & 1 : 2 \end{array}$
We can see clearly both are equal, so given numbers are in proportion.

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