Multiply the means to each other, and extremes to each other to determine or know if they are equivalent or proportion. If they are not equivalent they are not a proportion.
2 : 5 4 : 1
Means: 5 and 4 Extremes:2 and 1
5 × 4 = 20 2 × 1 = 2
20 and 2 aren't equal so they are not proportion
Means - Terms in the middle Extremes - Terms in first and last term
Answers & Comments
Determine whether 2:5 and 4:1 proportion or not
Solution:
Multiply the means to each other, and extremes to each other to determine or know if they are equivalent or proportion. If they are not equivalent they are not a proportion.
2 : 5 4 : 1
Means: 5 and 4
Extremes: 2 and 1
5 × 4 = 20
2 × 1 = 2
20 and 2 aren't equal so they are not proportion
Means - Terms in the middle
Extremes - Terms in first and last term
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➳Hence, the proven answer is they are not proportion