Proportion is a part of proportion; Proportion is the expression that two ratios are equal, which is the meaning of ratio.

There are four proportions, two in the front and two in the back.

In proportion, the product of two external terms is equal to the product of two internal terms, which is called the basic property of proportion.

The ratio represents the division of two numbers; There are only two items: the first item and the last item of the ratio. Proportion is an equation, which means that two proportions are equal; There are four projects: two external projects and two internal projects. The nature of the ratio: the first and second terms of the ratio are multiplied or divided by a non-zero number. This ratio remains unchanged. The nature of the ratio is used to simplify the ratio. Nature of proportion: In proportion, the product of two external terms is equal to the product of two internal terms. The nature of the ratio is used for the solution ratio.

2. Difference ①: The meaning, the number of items and the names of each part are different. The ratio represents the division of two numbers; There are only two items: the first item and the last item of the ratio. For example: A: B This is a ratio and an equation, indicating that the two ratios are equal; There are four projects: two external projects and two internal projects. A: B = 3: 4 This is the ratio.

Difference ②: The basic nature of ratio and the basic nature of proportion have different meanings and applications. The nature of the ratio: the first term and the last term of the ratio are multiplied or divided by a non-zero number (and the same). This ratio remains unchanged. The essence of proportion: in proportion, the product of two external terms is equal to the product of two internal terms. The nature of the ratio is used for the solution ratio. Connection: Proportion consists of two equal proportions.

The relation represen that ratio of two quantities can be express by the ratio.

Comparison is a division formula consisting of the former item and the latter item, except that "∫" (division symbol) is changed to ":"(comparison symbol), but the division formula represents an operation, and the ratio represents the relationship between two numbers. A fractional line similar to a fraction.