where x = # of ounces of cocoa butter you need.
From here, we show the math work --> Proportions
If 2 proportions are equal to each other, then we have:
Numerator 1 * Denominator 2 = Denominator 1 * Numerator 2
Solving for Numerator 1 we get:
Numerator 1 = (Denominator 1 * Numerator 2) / Denominator 2
Evaluating and simplfying using your input values, we get:
x = 0.8421052631578947 ounces