I'm sure they use ratios and proportions at many different points in the practice of
their profession. One obvious application is in construction of exact scale models of
aircraft and their components for wind-tunnel tests.
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ratios and proportions units, dimensions, and conversions logarithms arithmetic mean, error, percent error, and percent deviation just to name a few
You use ratios to mix ingredients in the correct proportions. Calculating standing times, cooking times. You may need to convert temperatures from ancestral recipe books (in Fahrenheit) to modern ovens (in Celsius).
That question is a lot like asking "How do you build what the customer ordered using a hammer and a saw ?" Before you can decide how to use your tools and what to do with them, you need to know what the customer ordered, and what final product is expected.
Mostly all sports use ratios to caculate the number of wins and losses.
You can use ratios of adjacent sides to prove if two rectangles are similar by comparing to see if the ratios are the same