Find the third proportional to $1$ m $60$ cm, $40$ cm.

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Solution

$\begin{matrix} 1 m 60 c m, 40 c m, . . . . . ∵ 1 m = 10 c m ∴ 1 m 60 c m = (100 + 60) = 160 c m \Rightarrow p r o p o r t i o n i s \frac{110}{160} = \frac{1}{4} T h i r d p r o p o r t i o n i s 40 \times \frac{1}{4} = 10 \end{matrix}$

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