Find $x$ in the following proportions:
$3.6 : 0.4 = x : 0.5$

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Solution

$3.6 : 0.4 = x : 0.5$
By cross product rule
Product of means $=$ Product of extreme
$x = \frac{3.6 \times 0.5}{0.4}$
$x = \frac{1.80}{0.4}$
$x = 4.5$

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