Write the proportion.
4.5 hours is to 3.0 hours as
3.9 hours is to 2.6 hours
The proportion can be written as:
4.5 hours / 3.0 hours = 3.9 hours / 2.6 hours
4.5 hours is to 3.0 hours as
3.9 hours is to 2.6 hours
4.5 hours / 3.0 hours = 3.9 hours / 2.6 hours