Are $12, 18, 8, 12$ in propotion?

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Solution

If $12, 18, 8, 12$ are in proportion, then
Product of extremes $=$ Product of means
$\begin{array}{rcl} 12 \times 12 & = & 18 \times 8 \\ 144 & = & 144 \\ ∵ LHS & = & RHS \end{array}$
Hence, $12, 18, 8, 12$ are in proportion

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