Fractions and ratios are practically the same thing. Fractions are rational numbers (notice the word "ratio" at the beginning of "rational"). They are sometimes used in slightly different contexts, but both express parts of a whole.
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It is a ratio
According to the dictionary some synonyms of ratio are proportion, comparative number, correlation, relationship, correspondence, percentage, fraction and quotient.
A fraction is a ratio
Certainly. Every fraction is a ratio.
The word you are looking for is "proportion." A proportion expresses the relationship between two quantities, indicating how one quantity relates to another, often in the form of a fraction or ratio.