Constant of proportionality from a table with fractions

Pick any pair from the table and divide y by x.

1. This table shows a proportional relationship: x = 2, 6 and y = 9, 27. What is the constant of proportionality?
2. This table shows a proportional relationship: x = 4, 8 and y = 34, 68. What is the constant of proportionality?
3. This table shows a proportional relationship: x = 4, 6 and y = 14, 21. What is the constant of proportionality?
4. This table shows a proportional relationship: x = 6, 12 and y = 27, 54. What is the constant of proportionality?
5. This table shows a proportional relationship: x = 6, 12, 18 and y = 48, 96, 144. What is the constant of proportionality?
6. This table shows a proportional relationship: x = 6, 8, 12 and y = 39, 52, 78. What is the constant of proportionality?
7. This table shows a proportional relationship: x = 4, 6, 12 and y = 10, 15, 30. What is the constant of proportionality?
8. This table shows a proportional relationship: x = 4, 10, 16 and y = 30, 75, 120. What is the constant of proportionality?
9. This table shows a proportional relationship: x = 6, 12, 18 and y = 24, 48, 72. What is the constant of proportionality?
10. This table shows a proportional relationship: x = 6, 12, 16 and y = 51, 102, 136. What is the constant of proportionality?
11. This table shows a proportional relationship: x = 2, 4, 10 and y = 13, 26, 65. What is the constant of proportionality?
12. This table shows a proportional relationship: x = 2, 8, 14 and y = 13, 52, 91. What is the constant of proportionality?
13. This table shows a proportional relationship: x = 6, 10, 14, 18 and y = 27, 45, 63, 81. What is the constant of proportionality?
14. This table shows a proportional relationship: x = 6, 8, 12, 16 and y = 48, 64, 96, 128. What is the constant of proportionality?
15. This table shows a proportional relationship: x = 2, 6, 10, 16 and y = 14, 42, 70, 112. What is the constant of proportionality?
16. This table shows a proportional relationship: x = 6, 8, 10, 14 and y = 54, 72, 90, 126. What is the constant of proportionality?
17. This table shows a proportional relationship: x = 4, 8, 14, 18, 24 and y = 70, 140, 245, 315, 420. What is the constant of proportionality?
18. This table shows a proportional relationship: x = 4, 8, 12, 14, 18 and y = 20, 40, 60, 70, 90. What is the constant of proportionality?
19. This table shows a proportional relationship: x = 6, 8, 14, 18, 22 and y = 108, 144, 252, 324, 396. What is the constant of proportionality?
20. This table shows a proportional relationship: x = 4, 6, 12, 16, 22 and y = 36, 54, 108, 144, 198. What is the constant of proportionality?