Final answer:
A proportion is a mathematical relationship between two quantities, where for every x units of one quantity, there are y units of another quantity.
Step-by-step explanation:
A proportion is a mathematical relationship between two quantities, where for every x units of one quantity, there are y units of another quantity. It can be written as a ratio, fraction, or using the word 'to'. For example, if there are 4 stars for every 3 circles, the proportion can be represented as 4:3 or 4/3.