Find the mean proportional between: 0.4 and 0.9 - Vidyadip

Question

Find the mean proportional between: $0.4$ and $0.9$

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Answer

$0.4 : \text{x} :: \text{x} : 0.9$
$\Rightarrow \text{x}^2 = 0.4 \times 0.9$
$\text{x} = \sqrt{0.36} = 0.6$
Mean proportional $= 0.6$

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