If the outcomes of the trials are equally likely, then (and only then) is it the number of favourable outcomes and the total number of trials.
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Probability is a measure of the likelihood of a given event and is a number in the range [0, 1]. That value, if expressed as a ratio, is a probability ratio. It can also be expressed as a percentage or a decimal fraction.
Only when an event is probability to happen between a range of 1 to 0 then it is a fraction.
An empirical estimate of the probability of an event is the ratio of the number of succesful outcomes to the total number of trials. By definition, the ratio is a fraction. However, there are many events for which the theoretical probability is related to irrational numbers. For example, it you randomly drop a pin on a floor of wooden boards, the probability that the pencil lies across a lateral join is related to pi. Being irrational, this cannot be expressed as a fraction.
a ratio is a fraction of two numbers a proportion is = fractions
The probability of an event is a number in the interval [0, 1]. It can be expressed as a fraction or ratio or as a percentage. Furthermore, if the probability of an event is p, where 0<p<1, and if q = 1-p, then the probability of the event can also be expressed as odds of p to q in favour.