The plural of ratio is ratios.
A ratio is a mathematical comparison between two or more quantities or values. It expresses the relationship between these quantities in terms of their relative sizes or amounts. Ratios are typically represented as a fraction or with a colon (:). They are used in various fields, including mathematics, science, finance, and statistics, to analyze and compare data. Ratios can provide insights into proportions, rates of change, and patterns, and are used to solve problems and make informed decisions based on the relationships between different quantities.