Rate is a comparison based on division.
Proportional
A rate.
That is known as a unit rate.
A rate is a ratio of two quantities: miles per hour, calories per cookie, dollars per person, ... a unit rate just specifies the units (miles, hours) of the two quantities.
I=Prt is a multiplication problem. All you need is the Principle, rate, and time. Then you multiply then together.
Imagine you have 20 objects at a cost of $90. Then the unit rate (the cost of one object) will be found by division. here $90 ÷ 20 = $4.50 (the unit price)
That's a rate, or more commonly, a ratio.
To compare to different units of measurement or a ratio that compares two quantities of different units (Ex: A car goes 100 miles in 1.5 hours, what is the rate)
[Directly] proportional quantities.
potato
The cell division rate slows down and evetually stops.
A rate is a fraction that compares two quantities measured in different units. If the denominator of the fraction is 1 unit, the rate is called a unit rate.
rate
Proportional
Proportional
Rate
A proportional relationship between two quantities is one in which the two quantities called the unit rate, the rate of change, or the constant of proportionality.