Do these ratios form a proportion?
628 units : 346 months
994 units : 400 months
To determine if the ratios form a proportion, we need to check if the two ratios are equivalent.
We can do this by cross-multiplying:
628 units * 400 months = 251,200
994 units * 346 months = 343,124
Since the cross products are not equal, the ratios do not form a proportion.