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If the degree measures of the angles of a triangle are in the ratio $3: 3: 4$, what is the degree measure of the largest angle of the triangle? 
Overseas Competition->Knowledge Point->Calculation Modules->Ratios and Proportions
The sum of the ratios is 10 . Since the sum of the angles of a triangle is $180^{\circ}$, the ratio can be scaled up to $54: 54: 72(3 \cdot 18: 3 \cdot 18: 4 \cdot 18)$. The numbers in the ratio $54: 54: 72$ represent the angles of the triangle. The question asks for the largest, so the answer is 