Answer:
A proportion is an equation that says that two or more ratios are equal. For instance if one package of cookies contain 20 cookies that would mean that 2 packages contain 40 cookies
201=402
A proportion is read as "x is to y as a is to b".
xy=ab
xy⋅y=ab⋅y
x⋅b=ab⋅yb
xb=ay
The products xb and ay are called cross products. The cross products of a proportion are always equal. If we want to check if two ratios form a proportion we can just check their cross products.
Example
Use cross product to determine if the two ratios form a proportion.
216,540
216=?540
216⋅16⋅40=?540⋅16⋅40
216⋅16⋅40=?540⋅16⋅40
2⋅40=?5⋅16
80=80
Here we can see that 2/16 and 5/40 are proportions since their cross products are equal.
Percent means hundredths or per hundred and is written with the symbol, %. Percent is a ratio were we compare numbers to 100 which means that 1% is 1/100.
Step-by-step explanation:
Hope it helps :)
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