Ratio and Proportion: 3:10 :: 12: X
X=0.27
X=40
X= 2.5
X= 3.6
Correct Answer : B
A ration of the form a:b=c:d is converted to a proportion as \(\frac{a}{b}=\frac{c}{d}\) where b and d are not equal to zero. Now applying the same concept to 3:10=12:X yields,
\(\frac{3}{10}=\frac{12}{X}\)
Find the value of X by cross-product
\(3X=12\ast10\)
Divide both sides by 3
\(\frac{3X}{3}=\frac{120}{3}\)
\(X=40\)
Thus, the value of X is 40.
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