In a proportion, the two internal terms are equal, and the ratio of the two ratios is two-thirds. Write the proportion formula

In a proportion, the two internal terms are equal, and the ratio of the two ratios is two-thirds. Write the proportion formula

4: 6 = 6:9, a lot

Each item of a proportional expression is an integer. The ratio of its two ratios is 3 / 5. The two inner terms are 15 and 10 respectively. This proportional expression is

10 × 3 / 5:10 = 15:15 △ 3 / 5
6：10＝15：25

A proportional formula, the sum of two external terms is 37, the difference is 13, and the ratio is 5 / 6. What can this proportional formula be?

Let: the ratio is: A: B = C: D, because: a + D = 37, A-D = 13, so: a = 25, d = 12, and because: A: B = 5 / 6, C: D = 5 / 6, so B = 30, C = 10. The ratio is: 25:30 = 10:12. If the positions of a and D are interchanged, we can get another formula: D: B '= C': A. according to the ratio is 5 / 6, we can get: B