Question : The fourth proportion of 1.4, 8.4, and 4.2 is:
Option 1: 2.8
Option 2: 0.7
Option 3: 25.2
Option 4: 6.4
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Correct Answer: 25.2
Solution : Assume the fourth proportion be $x$ So, $\frac{1.4}{8.4}$ = $\frac{4.2}{x}$ ⇒ $x$ = 8.4 × 3 ⇒ $x$ = 25.2 Hence, the correct answer is 25.2.
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