Tell whether the ratios form a proportion. 7. 1 to 3 and 7 to 21 3 Original Ratios z The ratios Cross Products Simplify || #21 라 FORM/DO NOT FORM a proportion because the cross products are EQUAL/NOT EQUAL Reducing reduced by reduced by reduced by reduced by 1 The ratios FORM/DO NOT FORM a proportion because they REDUCE DO NOT REDUCE down to the same ratio. 8​