Explanation:
a ratio is also a fraction. it has a slightly different meaning, as a fraction gives us a part of a whole (like 13/2 would mean 6 ½ times that whole), while a ratio deals with the relative size of parts of the whole.
like 13/2 as ratio 13:2 means that there are 2 parts of the whole (but we don't know how many parts there are making up the whole) with that relative size to each other.
but mathematically, fractions and ratios work in the save way, follow the same rules for calculation.
so, 13:2 is the same as any 13:2 × n:n (or 13/2 × n/n) ratio.
like
26/4 or 39/6
or yes, also 6.5/1