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Which number will best complete the relationship given below? 4 : 128 :: 6 : ?

A192

B195

C194

D193

Answer:

A. 192

Read Explanation:

4th proportion eqn is

a : b : : c : d

then d=b×cad=\frac{b\times c}{a}

=128×64=192\frac{128\times6}{4}=192

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