Two related quantities, one of which changes and the other changes with it. If the ratio (that is, quotient) of the two numbers corresponding to these two quantities is certain, these two quantities are called proportional quantities, and the relationship between them is called proportional relationship. Represented by letters: If the letters X and Y are used to represent two related quantities and K is used to represent their ratio, the (determined) proportional relationship can be expressed as follows: X. If the constant value in the proportion is called K, and the front and rear terms are X and Y respectively, then k=x/y, and K is the ratio of two numbers.

proportion

The meaning of inverse ratio

Inverse proportional quantity includes three quantities, one quantitative and two variables. Study the relationship between the expansion (or contraction) of two variables. A change in one quantity causes an opposite change in another. These two quantities are inversely proportional, and their relationship is inversely proportional.

The essence of inverse proportion

Two related quantities, one of which changes and the other changes, and the product of the corresponding two numbers in these two quantities is certain. These two quantities are called inverse proportional quantities. Their relationship is called inverse relationship. It is expressed by x×y=k (certain).

Mutual conversion between positive proportion and inverse proportion

When the value of x in the positive proportion (the value of independent variable) is transformed into its reciprocal, it is transformed from positive proportion to inverse proportion; When the value of inverse proportion x (the value of independent variable) is also converted into its reciprocal, it is converted from inverse proportion to positive proportion.