If the ratio of X to Y is $\frac{3}{4}$ and the ratio of Y to Z is $\f

If the ratio of X to Y is $\frac{3}{4}$ and the ratio of Y to Z is $\frac{12}{13}$, then the ratio of X to Z is

$ rac{13}{3}$
$ rac{1}{3}$
$ rac{4}{13}$
$ rac{9}{13}$
This question was previously asked in
UPSC CAPF – 2013
The ratio of X to Y is given as $\frac{X}{Y} = \frac{3}{4}$.
The ratio of Y to Z is given as $\frac{Y}{Z} = \frac{12}{13}$.
To find the ratio of X to Z ($\frac{X}{Z}$), we can multiply the two given ratios:
$\frac{X}{Y} \times \frac{Y}{Z} = \frac{X}{Z}$
Substituting the given values:
$\frac{3}{4} \times \frac{12}{13} = \frac{X}{Z}$
$\frac{3 \times 12}{4 \times 13} = \frac{X}{Z}$
$\frac{36}{52} = \frac{X}{Z}$
Simplify the fraction by dividing both numerator and denominator by their greatest common divisor, which is 4:
$\frac{36 \div 4}{52 \div 4} = \frac{9}{13}$
So, the ratio of X to Z is $\frac{9}{13}$.
To find the ratio of X to Z given ratios of X to Y and Y to Z, the ratios can be multiplied: $\frac{X}{Z} = \frac{X}{Y} \times \frac{Y}{Z}$.
This method works for any number of intermediate ratios in a chain, e.g., if you have A:B, B:C, C:D, then A:D = (A/B) * (B/C) * (C/D). It is important that the intermediate variable (Y in this case) cancels out during the multiplication.