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.
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You use a z test when you are testing a hypothesis that is using proportions You use a t test when you are testing a hypothesis that is using means
proportions are used in scale factors; scale factors ARE proportions
Proportions of differing proportionality
They made sure the profits were divided in the correct proportions.
proportions are used in calculations to help in the division of parts into units for effective distribution.