The radii of two cones are in the ratio 1 ∶ 3, whereas their volumes are in the ratio 1 ∶ 9. Which of the following statements is correct?
1
Their heights will be in the ratio 1 ∶ 3.
2
Their heights will be in the ratio 1 ∶ 9.
3
Their heights will be in the ratio 1 ∶ 2.
4
Their heights will be equal.