Solution: Since the relationship is directly proportional, we can set up a proportion to solve for the amount of tape needed for 4 presents.
If 12 cm is used for 3 presents, then for 1 present, the tape used is 12 cm / 3 = 4 cm.
For 4 presents, the tape needed is 4 cm/present * 4 presents = 16 cm.
Answer: 16 centimeters
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