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Can the four numbers 2, 3, 2.5 and 4 form a proportion? Why?
No, because it can be tested according to a relatively simple formula: because a / b = C / d
So a * d = b * C
According to the permutation and combination, that is to say, four numbers are arranged arbitrarily, and a correct proportion cannot be listed
4.5.7 the proportion of adding one number to three numbers is []
If 4:5 = 7: X, x = 35 / 4 = 8.75
4:5=x:7 x=28/5=5.6
4:7=5:x x=35/4=8.75
4:7=x:5 x=20/7
5:7=4:x x=28/5=5.6
5:7=x:4 x=20/7
So the value of X is: 35 / 4 = 8.75
28/5=5.6
20/7
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