In the proportion, $12 : 3 : : x : 1$ , the value of x is __________

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Solution

Find the missing term in proportion:
Given, $12 : 3 : : x : 1$ in proportion.
Product of means = Product of extremes
$\Rightarrow 3 \times x = 12 \times 1 \Rightarrow x = \frac{12}{3} \Rightarrow x = 4$
Thus, $x = 4$

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