perbandingan panjang lebar tinggi 4:3:2 jika volume balok 192cm³, maka luas permukaan balok adalah?

V = p.l.t
192 = 4x × 3x × 2x
192 = 24x³
x³ = 192/24
x³ = 8
x = 2

Panjang, lebar, tinggi balok sebenarnya:
p = 4x = 4(2) = 8 cm
l = 3x = 3(2) = 6 cm
t = 2x = 2(2) = 4 cm

Lp = 2(pl + pt + lt)
Lp = 2(8×6 + 8×4 + 6×4)
Lp = 2(48 + 32 + 24)
Lp = 2(104)
Lp = 208 cm² ✔