Proportion is a mathematical term, which means that two or more equations are equal in proportion. In a proportion, the product of two external terms is equal to the product of two internal terms, which is called the basic property of proportion.
In mathematics, if the change of one variable is always accompanied by the change of another variable, then these two variables are proportional. If these changes are always linked by a constant multiplier, then this constant is called a proportional coefficient or a proportional constant.
Proportion is the proportion of the number of parts in the group to the total number, which is used to reflect the composition or structure of the group.
Proportion can be divided into two types: scale and proportion. Two expressions with equal ratios are called proportions. Judging whether two ratios can form a proportion depends on whether their ratios are equal. The four numbers that make up a proportion are called proportional terms. The two terms at both ends are called external terms of proportion, and the two terms in the middle are called internal terms of proportion. In proportion, the product of two external terms is equal to the product of two internal terms, which is the basic property of proportion. One of the unknowns in finding the proportion is called the solution ratio.
The ratio represents the division of two numbers (there are two terms, the first term and the last term), and the ratio represents two formulas with equal ratios (there are four terms, two internal terms and two external terms).