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Mathematical proportional nature problem
The meaning of 1. Proportion: The equation composed of two ratios with equal proportions is called proportion.

For example:

The ratio of 6: 10 is 0.69: 15 is 0.6.

6: 10=9: 15 is a set of ratios.

2. The basic property of proportion: the product of two internal terms of a set of proportion is equal to the product of two external terms.

For example:

6: 10 = 9: 15 6 and 15 are external terms, and 10 and 9 are internal terms.

6 times 15=90 10 times 9=90.