To convert gallons to liters, you can use the conversion factor that 1 gallon is approximately 3.8 liters.
Julie bought 15.4 gallons of gasoline. To find out how many liters this is, you multiply the number of gallons by the conversion factor:
\[ \text{Liters} = \text{Gallons} \times \text{Conversion factor} \] \[ \text{Liters} = 15.4 , \text{gallons} \times 3.8 , \text{liters/gallon} \]
Now, perform the multiplication:
\[ \text{Liters} = 15.4 \times 3.8 = 58.52 \]
Therefore, Julie purchased approximately 58.52 liters of gasoline.