Place tilapia in a 15x10x1-in. baking pan. Mix chili powder, salt, cumin and pepper; sprinkle over fish. Broil 3-4 in. from heat until fish just begins to flake easily with a fork, 10-12 minutes.
Meanwhile, prepare rice according to package directions. Transfer to a microwave-safe bowl; stir in beans, corn and salsa. Microwave, covered, on high until heated through, stirring once, 2-3 minutes Serve with fish.