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31 - 19 = 12
19 - 13 = 6
13 - 10 = 3
12 + 6 + 3 = 21
If the sum of three numbers is 21 then the average of such numbers is 21/3 = 7
The number is 7
31 -7 = 24
19 - 7 = 12
13 - 7 = 6
10 – 7 = 3
To find the proportion (that is, ratio) divide each number (that is: 24, 12, 6 and 3) by 3.
24:12:6:3 = 8:4:2:1
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