You can only express ratios between things which use exactly the same units. Centimetre is a length unit. Cubic Centimetre is a volume unit
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The ratio of the surface area of a cube to its volume is inversely proportional to the length of its side.
The ratio is 1 to 2
7
As size increases, the s/v ratio decreases-- the s/v ratio of a cubic cell 1mm on a side is 6, but the s/v ratio of a cubic cell 3mm on a side is only 2.
The term "proportional" is used to denote a relationship between two things with respect to their size. In mathematics the meaning is that two quantities have the same or a constant ratio or relation.