Question : If 16 : $x$ :: $x$ : 196, find the positive value of $x$?
Option 1: 60
Option 2: 62
Option 3: 56
Option 4: 64
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Correct Answer: 56
Solution : Given, 16 : $x$ :: $x$ : 196 ⇒ $\frac{16}{x}=\frac{x}{196}$ ⇒ $x^2=16\times196$ ⇒ $x=4\times 14$ ⇒ $x=56$ Hence, the correct answer is 56.
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