"Proportion" is the teaching content of the sixth grade of primary school mathematics published by People's Education Press. Positive proportion refers to two related quantities, one of which changes and the other changes accordingly. If the ratio of the corresponding two numbers in these two quantities is certain, these two quantities are called proportional quantities, and their relationship is called proportional relationship.

Similarities:

1, the relationship between things has two variables, one is quantitative.

2. Among these two variables, when one variable changes, the other variable will also change.

3. The product or quotient of the corresponding two variables is certain.

Mutual transformation:

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