Question

find the value of x in each of the following proportions

4:5::4:X​

Answer 1

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$\fbox\red{Product of means = Product of extremes}$

→ 4:5::4:x

→ 5 × 4 = 4 × x

$x \: = \: \frac{5 \times 4}{4} \: = \: 5$

$Hence, \: x \: = 5$

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