Do the ratios 2 1 and 20 10 form a proportion?

To determine if the ratiOS ( \frac{2}{1} ) and ( \frac{20}{10} ) form a proportion, we can compare their cross products. The cross products are ( 2 \times 10 = 20 ) and ( 1 \times 20 = 20 ). Since both cross products are equal, the ratiOS do form a proportion.