To review the differences between proportional and non-proportional relationships, drag the following descriptions into the correct column of the T-chart.

Now try the following example problems.

The prices for sliced ham from the deli section of four different grocery stores are listed below.  Compare the price lists, and determine which grocery store is using a proportional relationship to price their sliced ham.

Copy the following tables into your notes, and fill in the missing information for each store.

Store A Pounds Price price pound   0.5     1     1.5     2	Store B Pounds Price price pound 0.5     1     1.5     2
Store C Pounds Price price pound   0.5     1     1.5     2	Store D Pounds Price price pound   0.5     1     1.5     2

Pounds	Price	price pound
0.5	$3.50	$7.00 per pound
1	$6.50	$6.50 per pound
1.5	$9.50	$6.33 per pound
2	$12.50	$6.25 per pound

Is this the store that uses a proportional relationship to determine the price of sliced ham?
Interactive popup. Assistance may be required. Check Your Answer No

How do you know?
Interactive popup. Assistance may be required. Check Your Answer The ratio of price pound is not constant.

Pounds	Price	price pound
0.5	$2.75	$5.50 per pound
1	$5.00	$5.00 per pound
1.5	$7.50	$5.00 per pound
2	$10.00	$5.00 per pound

Is this the store that uses a proportional relationship to determine the price of sliced ham?
Interactive popup. Assistance may be required. Check Your Answer No

How do you know?
Interactive popup. Assistance may be required. Check Your Answer The ratio of price pound is not constant.

Pounds	Price	price pound
0.5	$3.25	$6.50 per pound
1	$6.50	$6.50 per pound
1.5	$9.75	$6.50 per pound
2	$13.00	$6.50 per pound

Is this the store that uses a proportional relationship to determine the price of sliced ham?
Interactive popup. Assistance may be required. Check Your Answer Yes

How do you know?
Interactive popup. Assistance may be required. Check Your Answer The ratio of price pound is constant.

Pounds	Price	price pound
0.5	$3.00	$6.00 per pound
1	$6.00	$6.00 per pound
1.5	$9.00	$6.00 per pound
2	$11.00	$5.50 per pound

Is this the store that uses a proportional relationship to determine the price of sliced ham?
Interactive popup. Assistance may be required. Check Your Answer No

How do you know?
Interactive popup. Assistance may be required. Check Your Answer The ratio of price pound is not constant.

Four students measured the height of plants they were growing in their science class. They measured the height of the plants each week for four weeks.  Their results are shown in the data table below:

Which student had a plant that showed growth proportional to the number of weeks?
Interactive popup. Assistance may be required. Check Your Answer Frank

How did you know?
Interactive popup. Assistance may be required. Check Your Answer The ratio between plant height and the number of weeks is constant.