Series - double GP

In the following series, which number will replace the question mark?

4, 32, 16, 128, 64,?

Correct answer:

x6 =  512

Step-by-step explanation:

x1=4 x2=32 x3=16 x4=128 x5=64  GP: q1=x2/x1=32/4=8 q2=x3/x2=16/32=21=0.5 q3=x4/x3=128/16=8 q4=x5/x4=64/128=21=0.5  x6=x5 q3=64 8=512

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