The representatives are divided among the fifty states based on population size.

VOA: special.2009.08.14

This vast population is divided into over 300 distinct ethnic groups, and approximately 680 native languages.

UNESCO: AKRAB! (Literacy Creates Power)

Or there is the comparison of nurses per head of population, where a figure for UK population was divided by a figure for the number of nurses - obtained from the Department of Health in London.

BBC: Go Figure: How good are UK universities?

Local revenues divided by metro population with populations in two-team markets divided in half.

FORBES: Philadelphia 76ers