All polynomials are rational functions, that perhaps I should just imagine them as "over 1". Good. B

All polynomials are rational functions, that perhaps I should just imagine them as "over 1". Good. But the definition of a rational function has the concept of "ratio" in it. And when I found this:
A cylinder has a volume of ${\displaystyle (x+3)(x^2-3x-18)\pi }$ cubic centimeters. Find the height of the cylinder.
I wondered how this is a ratio of any sort?(It can't be a ratio of the expression over 1) So if ${\displaystyle a=(x+3),b=(x^2-3x-18)}$, and ${\displaystyle c=\pi }$,
can we say a,b,c are "in a ratio," i.e., a:b:c?