Answer:
the answer is 4x 
Step-by-step explanation:
I hope this helps
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Mark brainiest please
Okay, so try dividing a2 from a1 (to find geometric ratio, divide a2 from a1 :) )
12 ÷ 3 = 4
See if the other numbers have the same geometric ratio.
48 ÷ 12 = 4
192 ÷ 48 = 4
The common ratio is 4.