Step 1 :Let x be the multiplier for the ratio. Then, we have: \(1x + 2x + 3x = 1200\)
Step 2 :Solve for x: \(6x = 1200\) which gives us \(x = 200\)
Step 3 :Find the amount of each component: \(sand = 1x = 200 kg\), \(gravel = 2x = 400 kg\), and \(cement = 3x = 600 kg\)
Step 4 :\(\boxed{To make 1200 kg of dry concrete, you will need 200 kg of sand, 400 kg of gravel, and 600 kg of cement.}\)