Torque in a series-wound motor is approximately proportional to the square of the current.

The heights are approximately proportional to , the products of the lowest factors.

Because the base current is approximately proportional to the collector and emitter currents, they vary in the same way.

It is approximately proportional to the residual lignin content of the pulp.

The relative intensity of one frequency is approximately proportional to the frequency.

The conductivity will be approximately proportional to the salt concentration.

Construction man-hours are approximately proportional to the tons of steel fabricated.

In this case, the force of drag is approximately proportional to velocity, but opposite in direction.

Squat effect is approximately proportional to the square of the speed of the ship.

This ratio for on/off is approximately proportional to the working life of the diaphragm.