"9 inches is to 13 inches " can be expressed as a fraction where 9 is the numerator and 13 is the denominator:
[tex]\frac{9}{13}[/tex]"81 inches is to 117 inches" can be expressed as a fraction, where 81 is the numerator and 117 is the denominator:
[tex]\frac{81}{117}[/tex][tex]\frac{9}{13}=\frac{81}{117}[/tex]