The answer would be the sequence has a common ratio of 4. The explanation for this would be: To get the common ratio for get the simplest form of the two numbers, so 12/3 = 4 and 48/12 = 4So we know that their common ratio is 4. To check: 3 x 4 = 12 12 x 4 = 48 48 x 4 = 192 192 x 4 = 768