Question:The fourth proportional of `0.2`, `0.12` and `0.3` is : 

A `0.13` 
B `0.15` 
C `0.18` 
D `0.8` 

+ Answer
C 

+ Explanation
Let `0.2 : 0.12 = 0.3 : x`.

 Then, `0.2x = 0.12 xx 0.3`

 or, `x = (0.12 xx 0.3)/0.2`

     `= 0.18`.

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Md. Habib Ullah

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