Are the following in proportion?
$25, 30, 40, 48$ .

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Solution

Ratio of $25, 30 = 25 : 30 =$ $\frac{25 \div 5}{30 \div 5} = \frac{5}{6}$
Ratio of $40, 48 = 40 : 48$ $= \frac{40 \div 8}{48 \div 8} = \frac{5}{6}$
Hence $25 : 30 = 40 : 48$ .
So these are in proportion.

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