Write the three numbers in the same order you want to compare them
Express them in ratio form using colons, such as a:b:c
Divide all three numbers by their greatest common divisor if possible
Simplify the ratio until all terms are in the smallest whole numbers
If the numbers are decimals or fractions, convert them to whole numbers first
If needed, multiply all terms by the same number to remove decimals or fractions
Check that the ratio is fully simplified and equivalent to the original numbers