test whether each item show a proportion or not

Answer: All of them
Explanation: 1. 13/9 = 26/18
3. 4 : 9 = 12 : 27
5. 3 : 7 = 12 : 28
Answer: All of them
Explanation: 1. 13/9 = 26/18
3. 4 : 9 = 12 : 27
5. 3 : 7 = 12 : 28