Yeah, 1600:1200 divided by 100 = 16:12 divided by 4 = 4:3 (aspect ratio). Which is standard. If you can divide the first number by 4 and the 2nd number by 3, you should be safe (16:9 for widescreen monitors usually). 1280 divides by 4, 960 divides by 3 ... 1024 does not divide by 3, so it's not a true 4:3 aspect.