What's In A. Tell whether each pair of ratios form a proportion. Write YES if it is a proportion and NO if it is not 1) 2:5 = 4:10 2) 3:4 = 6:8 3) 5:6 = 4:5 4) 4:12=3:9 5) 12:4 = 10:5 B. Puzzle: Use each number once to form three proportions. 3 9 76 2) 8 4 49 2 12 4 1​