Notice that to obtain 8.422.4 we must multiply 38 by 2.82.8.
2.8/2.8* 3/8 = 8.4/22.4 âś“
Next, let's multiply the left-hand side of each of the remaining proportions by 2.82.8 and compare the results to the corresponding right-hand sides.
Proportion2: & 2.8/2.8* 2/3 = 5.6/8.4 * [0.2cm]
Proportion3: & 2.8/2.8* 5/6 = 14/16.8 âś“ [0.2cm]
Proportion4: & 2.8/2.8* 7/9 = 19.6/25.2 âś“
As we can see, there is a discrepancy in the second proportion since the result is not equal to 57.5. In fact, in this particular case, we have to multiply the left-hand side by 2.52.5 to obtain a true statement.
Ratio2: & 2.5/2.5* 2/3 = 5/7.5 âś“
In conclusion, the proportion that does not belong with the other three is the second one. The other three proportions have the same factor.
