A) 16
B) 34
C) \[\sqrt{68}\]
D) 60
Correct Answer: A
Solution :
Let the proportional average = x \[\therefore \] \[4:x::x:64\,\,\,\Rightarrow \,\,\frac{4}{x}=\frac{x}{64}\] \[\Rightarrow \] \[{{x}^{2}}=4\times 64\] \[\Rightarrow \] \[x=\sqrt{4\times 64}=\sqrt{{{2}^{2}}\times {{8}^{2}}}\] \[\Rightarrow \] \[x=2\times 8=16\]
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