I haven't paid attention to the 3/4* rate up odds, but here's a reddit posting that says a 4* is 1.5% (or half of the total 4* chance), and 3* is 4% (or 1/10 of the total 3* chance), at least on that specific banner:
https://www.reddit.com/r/grandorder/comments/89nzhb/after_nearly_3_years_dw_finally_publicise_the/
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