Final answer:
To travel 162 miles, Mackenzie would need 6 gallons of gas.
Step-by-step explanation:
To find out how many gallons of gas Mackenzie would need to travel 162 miles, we can set up a proportion using the given information. Since 108 miles is equivalent to 4 gallons of gas, we can set up the proportion: 108 miles / 4 gallons = 162 miles / x gallons. Cross-multiplying gives us 108x = 4 * 162. Dividing both sides by 108 gives us x = (4 * 162) / 108 = 6. Therefore, Mackenzie would need 6 gallons of gas to travel 162 miles.