Proportions

Question

Erik bought $103 Canadian with $100 American. At this rate, how many Canadian dollars can he buy with $235 American?

Answer 1

To write out the proportion in the form of Canadian $ to American $ :

 

103 is to 100  as  x is to 235

 

As a fractional proportion:

 

103/100 = x/235   cross multiply

 

100x = 235(103)

x = 235(103)/100

x = $242.05

 

 

Answer 2

Ratio

x $C / 235 $A = 103 $C / 100 $A

x = 103 * 235 / 100 = $242.05

Or stepwise
100 $A is worth 103 $C
so
1 $A = 1.03 $C
just to put it into 1:something ratio
so if we want to find out how much 235 can get you,
if you multiply 1 $A by 235, you have to multiply the other side by 235 as well
235 $A = ? $C
235 $A = 1.03 * 235 $C = 242.05 $C

Answer 3

Hello,

 

For this proportion you want to make sure to keep like numbers together.

 

103 = x          Canadian Dollars

100    235       American Dollars

 

x = 242.05