Which of the following are in proportion?
$5 : 9$ and $200 : 360$

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Solution

First we write the ratios in fraction form,
$5 : 9 =$ $\frac{5}{9}$ and $200 : 360 = \frac{200}{360} =$ $\frac{200 \div 40}{360 \div 40} = \frac{5}{9}$
Hence $5 : 9 = 200 : 360$
So these are in proportion.

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