Answer:
5/9 = 10/16 is not proportional
Explanation:
5/8=10/16 (If you simplify you will get 5/8=5/8 which is true)
25/40=10/16 (If you simplify you will get 5/8=5/8 which is true)
15/24=10/16 (If you simplify you will get 5/8=5/8 which is true)
5/9≠10/16 (If you simplify you will get 5/9=5/8 which is not true)
Hope this helps