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1. First define a variable that will hold the value for the first dimension (Size_A in the screenshots)
2. In the sketch set the dimension of the first item to the variable you created (#Size_A in the first screenshot).
3. Set the dimension of the second item to this equation max(#Size_A, 1.618) as seen in the second screenshot.
Whenever you change the variable Size_A, both dimensions should match as long as the value is equal to or greater than 1.618. If the value is lower than that, the second dimension should stay at 1.618.
Link to the document: https://cad.onshape.com/documents/9181d40b4dfc48a2cd88cf56/w/db0b1bd14efc009014d87877/e/9b4069c4a3a8e0751e3a6b5c