Question

Which ratios form a proportion?

1. 4/10 and 10/25
2. 4/11 and 6/13
3. 4/9 and 9/4
4. 3/5 and 9/25​

Answer 1

Only the first ratio

Answer 2

1. 4/10=2/5 , 10/25=2/5 (simplify)
2. 4/11 , 6/13 (cannot be simplified)
3. 4/9 , 9/4=2 1/4
4. 3/5 , 9/25=3/5 (simplify)
The answers are 1 and 4.