Express your two ratios as fractions. Use "x" to signify the unknown quantity. For example, if you have 2/3 and want to determine the equivalent ratio with a denominator of 8, you would express the second ratio as x/8.
Cross-multiply the numerators and denominators. Multiply 3 by x and 2 by 8.
Divide both sides of the resulting equation, 3x = 16, by 3. The "x" should equal 5.33.