[tex]\frac{1}{4}\ ounce\ of\ yeast\ in\ 2\frac{1}{4}teaspoons\ of\ years\\
x\ ounces\ of\ yeast\ in\ 2\ teaspoon\ of \ years\\\\
proportion:\\
\frac{1}{4}\ -2\frac{1}{4}\\
x-2\\\\cross\ multiplication\\\\
2*\ \frac{1}{4}=2\frac{1}{4}x\\\\
\frac{1}{2}=\frac{9}{4}x\ \ \ | divide\ by\ \frac{9}{4}\\\\
x=\frac{1}{2}*\frac{4}{9}=\frac{2}{9}\\\\ \frac{2}{9}\ ounces\ of\ yeast\ are\ needed.
[/tex]
