Write a story problem that is associated with this proportion, then solve your problem. 5/$21 = 12/n

Fringlebats cost $21 for 5 of them.

How much will 12 of them cost?

Sure! Here's a story problem associated with the given proportion:

Alex is planning a road trip. He wants to calculate the cost of renting a car. He knows that on his previous road trip, he rented a car for 5 days for $21 per day. This time, he wants to rent a car for 12 days, but he doesn't know the cost per day. Can you help him figure out how much he will need to pay for the car rental this time?

To solve the problem, we'll use the given proportion: 5/$21 = 12/n, where n represents the unknown cost per day.

To find the value of n, we can cross-multiply and solve for n as follows:

5/n = 12/$21

To cross-multiply, we multiply the numerator of the first fraction (5) by the denominator of the second fraction ($21), and vice versa:

5 × $21 = 12 × n

$105 = 12n

Now, we divide both sides of the equation by 12 to isolate n:

$105 / 12 = n

n ≈ $8.75

Therefore, Alex will need to pay approximately $8.75 per day to rent a car for 12 days on his road trip.