Half, one third, one sixth and one ninth can not form proportions

Proportions can be composed.

If four numbers are able to form a proportion, then their ratios should be equal. We can write them in fractional form:

Half = 3 6

One third = 2 6

Sixths = 1 6

One in nine = 1 9

Now let's calculate the ratio of any two numbers:

It can be found that the ratio of any two numbers is constant, i.e., 3:2 and 2:1 and the last one is 4:

12-4）=4：8=（12-4）*（18-4）。Therefore, these four numbers constitute a proportional relationship.

Specifically, they have a ratio of 3:2:1:

4 8 or 18:12:6:

16。The last ratio can be further reduced to 2:1 or 8:

4。It is important to note that when calculating the ratio of one ninth to one sixth, we reduce one ninth to one-third, and at the same time reduce one-sixth to one-half. This is done because when finding the ratio of two numbers, we need to have them have the same base (i.e., the same denominator). Without simplification, it is not possible to get an accurate ratio of them directly.

To sum up: four numbers can form proportions when and only if the quotient of any two numbers is equal. In order to determine whether it is equal, it is necessary to first write all the numbers in the form of general division, and carry out the necessary reduction and simplification operations.

No, because they don't have a common ratio, like 1 6 3 1 2, 1 9 6 2 3.

Of course you can, I write to you: so:

First pass: 1 2 5 7 9 7 9 10 centimeters is 70:

So the ratio that makes up the cavity is 35:50:90:63

Hello Zizen: 7 9x3 5 1 2=14 15 If you don't understand anything about this question, you can ask, if you are satisfied, remember.

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Seven eighths to 21 out of 20 equals one-half to three-fifths.

Solution: 1 2x=7 8 3 5

x=21/40÷1/2

x=21/20

Eight out of nine to x is equal to one in two to three in two.

x out of 2 = 8/9 3/2

x 2/2 = 4/3

x = 4/3 2

x = 8/3

Thirty ratios (30, 1, 2=15) are equal to.

3 5 1 12 = One twelfth is equal to three fifths.

Twenty to (20, 2, 9 = 90) is equal to two out of nine.

3/8*3/5=1/2*x

x=9/40*2=9/20

Satisfied with Ao. Because the ratio is equal to the division sign, this question can do this.

30 20 Two ninths = 90

Thirty to sixty equals 20 to 90 equals two-ninths.

If your problem is solved, please go upstairs.

Seven out of nine: (70 27) = one-half: three-fifth.

3 and 1 : 1 and 3 5

1 2 1 3 5

x = 8 one-eighth by [one-half (three-fifths by ten-ninth)] solution: original formula = 1 8x[1 2-(3 5x10 9)]1 8x[1 2-2 3].

1/8x[3/6-4/6]

1/8x（-1/6）

Because one-quarter of the six-quarter = one-quarter of the silver tremor of one-quarter = 1 8, so the front is defeated, 1 6:1 2 = 1 4:3 4

First, find the multiple of the most disturbed minor common, which is 36

1 foot stool 12 = 3 36

The ratio of the Li Brigade is 12:9:4:3

1/2:1/3:1/6:1:4

Also multiply by the least common multiple of the denominator of 12

7/9 3/5 1/2

7/15 1/2

14/15

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One half to three fifths is equal to 5 to 6

Fill in 14/15