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U₂ = ar ¹
2 = ar ¹
U₅ = ar ⁴
54 = ar³ * r¹
54 = ar³ * 2
r³ = 54 / 2
r³ = 27
r = ∛27
r = 3
ar ⁿ⁻¹ = 2
a * 3¹ = 2
a = 3 - 2
a = 1
Maka U₄ = ar ³
U₄ = 1 * 3 ³
U₄ = 1 * 27
U₄ = 27