How do you do percent proportions? i'm learning those right now, and i have no idea what to do. my teacher isn't the best at explaining things. an example of what i don't get is "4% of what number is 10? " also things such as "16 is what percent of 64? "

Remember these tips:

=>  To turn a percent into a decimal, move the decimal point 2 places to the left.
4% means 0.04 ,  and  50% means 0.5 .

=>  To turn a decimal into percent, move the point 2 places to the right.
0.062 means 6.2% .

=>  In math, whenever you see the word "of", it almost always means "times".
So your 2nd example means

                                    16 = (mystery number) x (64).

Divide each side by 64 :    16/64 = mystery number = 1/4 = 0.25 .

Move the point 2 places to the right.    0.25 = 25% .