Given that 1 / 2, 1 / 3 and 3 / 4 of the three numbers, together with the ratio of one number to the original three numbers, write out all possible numbers

Given that 1 / 2, 1 / 3 and 3 / 4 of the three numbers, together with the ratio of one number to the original three numbers, write out all possible numbers

nine-eighths

Given 3, 2, 5 three numbers, and then add a number, the four numbers constitute a proportion

Because the property of proportion is that the inner term product is equal to the outer term product (A: B = C: D, BC is the inner term, ad is the outer term). Therefore, when 3,2 are the inner term, the number is 3 * 2 / 5 = 1.2. When 2,5 are the inner term, the number is 2 * 5 / 3 = 3 and 1 / 3, and when 3,5 is the inner term, the number is 3 * 5 / 2 = 7.5

Add a number to the three numbers 12, 8 and 16 to make up the proportion______ 、______ Or______ .

Choose 12 and 8 as the two internal items,
Then 12 × 8 △ 16 = 6,
Choose 12 and 16 as two internal items
Then 12 × 16 △ 8 = 24,
Choose 8 and 16 as two internal items,
Then 8 × 16 △ 12 = 32
3；
So the answer is: 6, 24, 32
3．

Add a number to the three numbers 12, 8 and 16 to make up the proportion______ 、______ Or______ .

Choose 12 and 8 as the two internal items,
Then 12 × 8 △ 16 = 6,
Choose 12 and 16 as two internal items
Then 12 × 16 △ 8 = 24,
Choose 8 and 16 as two internal items,
Then 8 × 16 △ 12 = 32
3；
So the answer is: 6, 24, 32
3．

4, 5, 12 and 15 constitute 8 different proportions (unit 3 knowledge, Volume 2, grade 6) For example: 12:4 = 15:5

1、4：5=12：15
2、4：12=5：15
There are only two, because the product of two inner terms is the product of two outer terms, and the ratio is calculated by changing the positions of the inner and outer terms at the same time

Write the four numbers 4, 5, 12 and 15 in a ratio of ()

4：12=5：15
12：4=15：5
4：5=12：15
5：4=15：12
Choose any one!

Make up the proportion of 5, 12, 4 and 15______ .

Because 5 × 12 = 4 × 15,
So 5:4 = 15:12;
So the answer is: 5:4 = 15:12

Five, eight, fifteen and twenty-four are divided into eight fifths according to the required proportion: (): () = (): ()

8 out of 5: (8): (5) = (24): (15)
8 / 5, the numerator and denominator are multiplied by 3 = 24 / 15

The ratio of 5, 8, 15 and 24 is 5 / 8: (): () = (): ()

（5 ）：（8 ）=（15 ）：（24 ）

The ratio of 5,8,15 and 24 is 1 / 3: (): () = (): ()

5:15=8:24