Rectangular cuboid

The rectangular cuboid has a surface area 5334 cm2, its dimensions are in the ratio 2:4:5. Find the volume of this rectangular cuboid.

Result

V =  23519.015 cm3

Solution:

a=2 x b=4 x c=5 x S=5334 cm2  S=2(ab+bc+ac)=2(2 4 x2+4 5 x2+2 5 x2) S=76 x2  x=S/76=5334/768.3776 cm  a=2 x=2 8.377616.7552 cm b=4 x=4 8.377633.5104 cm c=5 x=5 8.377641.888 cm  V=a b c=16.7552 33.5104 41.88823519.0145=23519.015 cm3a = 2 \ x \ \\ b = 4 \ x \ \\ c = 5 \ x \ \\ S = 5334 \ cm^2 \ \\ \ \\ S = 2(ab+bc+ac) = 2(2 \cdot \ 4 \ x^2 + 4 \cdot \ 5 \ x^2 + 2 \cdot \ 5 \ x^2) \ \\ S = 76 \ x^2 \ \\ \ \\ x = \sqrt{ S / 76 } = \sqrt{ 5334 / 76 } \doteq 8.3776 \ cm \ \\ \ \\ a = 2 \cdot \ x = 2 \cdot \ 8.3776 \doteq 16.7552 \ cm \ \\ b = 4 \cdot \ x = 4 \cdot \ 8.3776 \doteq 33.5104 \ cm \ \\ c = 5 \cdot \ x = 5 \cdot \ 8.3776 \doteq 41.888 \ cm \ \\ \ \\ V = a \cdot \ b \cdot \ c = 16.7552 \cdot \ 33.5104 \cdot \ 41.888 \doteq 23519.0145 = 23519.015 \ cm^3



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Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):

Showing 2 comments:
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Amy
Not very useful plz give worked example with steps

2 years ago  2 Likes
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Dr Math
Example is complete with solution  step-by-step

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