You must be able to multiply numbers.
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Length and width must have equal proportions.
Yes, you must.
Many researchers use a proportions test to verify the statistically significant difference between two independent proportions. This test has a number of requirements such as the use of random sampling, samples must be independent, at least 10 successes and 10 failures, and the population is at least 10 times the size of the sample.
proportions are used in scale factors; scale factors ARE proportions