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.