For example :
a rate of 30 miles per hour.
Here is a video and a picture for more help :
What is a ratio?
A ratio is when you compare 2 quantities.
For example : the ratio for red circles to clue is 4:6 .
A proportion is like a part in relation to the whole.
for example :
5hours to travel 360 kilometers is about _____km/h .
360\5 = 72 km per hour .