@parados,
Thanks man, you helped me save a few bucks with your advice. I got a relatively new alloy rim for my Camry from the local junkyard for half the price as the lowest price on ebay. Now I'm using the factory rim of the spare tire as the right tire's rim, and the junk yard's rim with the tire of the previous spare for the spare wheel.
Luckily this happened on a normal road, and not on the highway. The mechanic said the back two tires were very worn out, which may have caused the drastic slide on the road under harsh braking, so I went ahead and got new tires for all the wheels.