There have been volumes written on this question.

Basically, two sets are equipotent if there is a one-to-one correspondence between them. Consider the set of counting numbers: N={0,1,2,3…}. Any set equipotent with N is said to be countable. This collection of sets includes the set of integers and the set of rational numbers. However, the interval [0,1] can be shown to be uncountable. Therefore the set of irrationals is uncountable. Any set equipotent with [0,1] is said to have the power of the continuum. These sets include the irrationals, the reals, the complex, etc. The continuum hypothesis states the there is no set with cardinality strictly between N and R. Most mathematicians take the continuum hypothesis as an axiom.

So, to your question. Any talk of ‘ratios’ at this level of abstraction is quite impossible.