Question
Determine if the $24, 28, 36, 48$ are in proportion.

Answer

$24 : 28$ $=\frac{24}{28}=\frac{24 \div 4}{28 \div 4}$[$\therefore$$H.C.F. (24, 28) = 4]$
$=\frac{6}{7}$ $= 6 : 7$
$36 : 48$ $=\frac{36}{48}=\frac{36 \div 12}{48 \div 12}$[$\therefore$$H.C.F. (36, 48) = 12]$
$=\frac{3}{4}$ $= 3 : 4$
$\because$ $6 : 7$ $\neq$ $3 : 4$
$\therefore$ $24, 28, 36, 48$ are not in proportion.

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