The answer depends on what the formula is for: its surface area, volume, mass or any other characteristic. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
The formula will depend on what it is that you are trying to find: the volume or the surface area.
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If the volume of the smaller rectangular box is 27 in3, what is the volume of the larger rectangular box?
You didn't give enough information. By box do you mean cube or any rectangular prism?
A small rectangular box!
Rectangular cuboid
Length = Volume divided by (Width X Heigth)
A rectanglar or even rectangular, is an adjective and there is no such thing. You can have a rectangular pyramid or a rectangular prism. The formula will depend on which of these it is and on what information is available to you.
A rectangular prism can be thought of as a rectangular box, which has eight vertices.
It would be one box.
Rectangular Box?
a rectangular prism is like a tissue box.