Proportions

This is to that as what is to what?

Also known as the rule of three, these phrases help you find the required number to maintain a proportion.

6 is to 60 as 8 is to what | 80
5 is to 10 as what is to 80 | 40

These phrases work with units:

5 km is to 500m as 5 cm is to what | 5 mm
30 minutes is to 3 hours as what is to 60 seconds | 10 seconds