Solving a proportion in two different methods 9/q = 15/10

The video tutorial discusses solving a proportion problem using cross multiplication and an alternative method involving the least common denominator. The instructor explains the problem setup, demonstrates the cross multiplication method, and provides an alternative approach to eliminate fractions. The tutorial emphasizes understanding the concept of cross multiplication in solving proportions.

How can you eliminate fractions in an equation according to the teacher?

What is the significance of understanding where cross multiplication comes from?