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A ratio is a comparison between two values. The values can be integers or fractions (ratios).
You can use ratios of adjacent sides to prove if two rectangles are similar by comparing to see if the ratios are the same
a fraction is an amount of something and a ratio is how much of something there is.
you divide the numerator by the denominator, if you get the same to the other fractions, it is proportional. Another solution is if you reduce the two fractions to simplest form and they are the same, they are also proportional.
They are all different ways of representing the same thing: a relationship between two numbers.