Concept:The series alternates between multiplying by 3 and dividing by 2.Explanation:Start with 4. Multiply by 3 to get 12.Divide 12 by 2 to get 6.Multiply 6 by 3 to get 18.Divide 18 by 2 to get 9.Now multiply 9 by 3 to find the missing term: 9×3=27.