How much would 45 feet cost if the cost of 150 feet of wire is $19.20??

If the cost of 150 feet of wire is $19.20 and you want to purchase 45 feet of cable. Take the price $19.20 and divide it by the amount of wire purchased 150 feet of wire that is (150/19.20) to get the price for each foot of wire which will give you $0.128 per foot.

Then take the new amount you want to purchase which is 45 feet of wire multiply by the price for each foot which is $0.128, which is (45*0.128) your final answer should be $5.76. Therefore the cost of 45 feet of wire is $5.76

If you purchase 150 feet of wire for $19.20 you would take the $19.20 and divide it by the total footage of 150 feet and this would give you the price per foot, which would be 0.128 cents per foot.

Then if you take the forty-five feet total and multiply it times the price per foot, this would tell you that your cost would be $5.76 for the forty-five feet. Then to prove your equation divide $5.76 by the 45, which equals cents and then multiply 0.128 cents times 150 which 19.20.