Find which of the following numbers are in the proportion :
$20, 18, 40, 36$

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Solution

Finding which of the given numbers are in the proportion :
Ratio of $20$ to $18 = \frac{20}{18} = \frac{20 \div 2}{18 \div 2} = \frac{10}{9}$
Ratio of $40$ to $36 = \frac{40}{36} = \frac{40 \div 4}{36 \div 4} = \frac{10}{9}$
We know that two ratios are equal, we say they are in proportion.
Since, $20 : 18 = 40 : 36$
Hence, $20, 18, 40, 36$ are in proportion.

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