Hello, Myllhya. Whenever using unit rate, you set up a proportion: [tex]\frac{y(dependent)}{x(independent)}[/tex]. Imagine the line in between x and y is the word 'per'. Finding how many feet in a given number of inches is the same as saying 'how many feet per inch', so this will be written as [tex]\frac{feet}{inches}[/tex] because feet becomes dependent on inches. Or, vice versa, the problem asks for inches for a certain amount of feet, you apply the same concept. The number of inches depends on feet, so you proportion is [tex]\frac{inches}{feet}[/tex].
I hope this was helpful. : )
