They are all different ways of representing the same thing: a relationship between two numbers.
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No but percentages are ratios.
It really depends on the type of problem you are trying to solve. Did you have a specific problem in mind?
Look for examples and context. For example, a recipe will always talk about fractions of cups, tablespoons, etc. If you're talking about the chance of rain, you would express that as a percentage.
A ratio is a comparison between two values. The values can be integers or fractions (ratios).
Think of a ball. In different countries, it might be called a bola, a palla or a balle but it's still a ball. Fractions, decimals, percents and ratios are different ways to express relationships between numbers. If there are two things and you have one of them, it could be said that you have 1/2 of the objects, or 0.5 of them or 50 percent of them or 1:2 of them but there are still two objects and you have one of them.