The latest arson happened north of Cherry Lane near South Vista Avenue and West Williamsport Lane, police said.
The circumstances involved in fire in the latest arson and the previous fires - which happened nearby at the Oak Park Village apartments off Cherry Lane - all appear similar, police added.
In the earlier three cases, the fires caused major damage to the exteriors and interiors of garages.
Police said in the latest fire, a bush burned and damaged the siding of a house.
No injuries have been reported in any of these arson fires.
Anyone with information is urged to contact Crime Stoppers at 343-COPS (2677), www.343COPS.com, or leave a tip using the P3 Tips app for your mobile device. Your identity will not be revealed if you want.