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3 : 6 = x : 72

The product of the means, must be equal to the product of the extremes.

6x = 72(3)

6x = 216

x = 36

3 : 6 = 36 : 72

2. For example, there were two values missing. (Same question I've encountered here at brainly)

x : 8 = y : 56

Make sure that when you gave a value for the missing number in the first ratio (which is x is to 8 in my example), the ratio must be not reduce in lower term. So, we'll have x = 7. Now, we just need to find the value of y.

8y = 56(7)

y = 49

7 : 8 = 49 : 56

3. Partitive proportion. The sum of the numbers were given. For example, you have this question: The sum of three numbers having a ratio of 2 : 3 : 4 is 45. What's their value?

2x + 3x + 4x = 45

x = 5

2(5) = 10

3(5) = 15

4(5) = 20

2 : 3 : 4 = 10 : 15 : 20

4. Same. For example, you have this question: The product of two numbers having a ratio of 2 : 5 is 90. What are the two numbers?

(2x)(5x) = 90

10x² = 90

x = 3

2(3) = 6

5(3) = 15

2 : 5 =