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The value of a ratio - of two numbers - is the value of the first divided by the second.
Every insulation has a different R value. It ultimately is determined by which insulation you will be using. Now lets do rough estimate. 4" thick, regular fiberglass mat has R-value of 13. Assuming that plywood has the same to half the insulating value of fiberglass, 1/2" plywood would have 1/8 to 1/16 of R-value of that 4" mat. Roughly R-1.6 to R-0.8
In science, the ratio of two quantities is the value of the first quantity divided by the value of the second one. For example, the ratio of 10m to 5m is 2.
The value of the Golden Ratio is (1 + sqrt(5))/2. It is visually appealing because it is!
Equivalent Ratios