I want to ask a conditional question based on the mathematical relationship between the answers to two prior questions. For example, questions 1 and 2 are both numeric answers. I only want to ask question 3 if the answer to question two divided by the answer to question one is greater than one.
There is not a built in feature in SurveyGizmo for this, but SG does offer you the option to add custom functionality via scripting.
What you are looking to do can be done with Custom Scripting (though I don’t personally have an example to provide). If you have development resources, it’s worth taking a closer look here:
Alternatively, SurveyGizmo offers Programming Services for custom projects such as would be required in your situation:
Hope this helps!