Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number.
3 : 72 :: 21 : 504 :: 36 : ?
3 : 72
3 ==> $$3\times24$$ = 72
21 : 504
21 ==> $$21\times24$$ =Â 504
36 : ?
36Â ==> $$36\times24$$ =Â 864
So here '864' will come in place of the question mark.
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