1. Convert the dimensions of the sheet to inches:
   • Longitud: 4 pies = 48 pulgadas
   • Ancho: 8 pies = 96 pulgadas
2. Convert the thickness to decimal form:
   • 3/16 pulgada = 0.1875 pulgadas
3. Calculate the area of the sheet in square inches:
   • Área = Largo x Ancho = 48 inches x 96 pulgadas = 4,608 square inches
4. Calculate the volume of the sheet in cubic inches:
   • Volumen = Área x Espesor = 4,608 square inches x 0.1875 pulgadas = 864 pulgadas cúbicas
5. Convert the volume from cubic inches to cubic feet:
   • Volumen (pie cúbico) = Volume (pulgadas cúbicas) / 1728 = 864 pulgadas cúbicas / 1728 = 0.5 pie cúbico
6. Determine the density of aluminum. The density of aluminum is typically around 0.098 libras por pulgada cúbica.
7. Multiply the volume in cubic feet by the density to calculate the weight in pounds:
   • Peso (libras) = Volume (pie cúbico) x Density = 0.5 pies cúbicos x 0.098 lbs/in³ ≈ 0.049 libras

Por lo tanto, un 4×8 3/16 hoja de aluminio would weigh approximately 0.049 libras.