Proportional (adjective)

1. Relating to, having, or being a proportion.
2. In accordance with a proportion or ratio; proportional to the size or amount of something else.

Origin:

Late 16th century; earliest use found in william fulke (1538–1589), church of england clergyman and controversialist. from classical latin proportionalis, from proporciō (see proportion n.) + -alis.

Examples:

1. The profits of the company are proportional to the amount of work done by the employees.
2. His salary increase was proportional to his years of service.
3. The proportion of salt in the mixture is critical to the recipe.
4. She ate a proportional amount of food to her body weight.
5. The size of the cake was proportional to the number of guests.