Answer: not proportional
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Step-by-step explanation:
Rectangle A = 12 x 15
Rectangle B = 18 x 21
Divide the corresponding sides of each rectangle.
I'll make the dividing order B over A.
- smaller sides: B/A = 18/12 = 1.5
- larger sides: B/A = 21/15 = 1.4
The results 1.5 and 1.4 don't match up. They're close, but not quite the same.
Therefore, the rectangles are not proportional
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Another approach:
Divide the larger side over the smaller side for each rectangle separately.
- A: 15/12 = 1.25
- B: 21/18 = 1.167 approximately
The results don't match, so the rectangles are not proportional