my liquid cal-mag-d3 has
300mg magnesium, and
so i have assumed that's a good ratio. however, if you multiply all that by 10 to get up to 4000 IU D3, i really don't think you'll easily find supplements with 6000mg calcium and 3000mg magnesium.
when i was on the liquid d3 i just put my 10,000IU, then later dropping to 4000IU, drops into a spoonful of the 600/300/400 liquid without worrying about the ratio too much.
i have been really slack with the supplements lately so that i could get some semi-baseline bloodwork done, gotta get back in the saddle when i get my lab results back! then i started having a problem with dysphagia so had to get some magnesium in there to fix it and that just rolled the calcium and d3 back into the regimen automatically.
i'm still being lazy compared to before - i just take two cal-mag pills and one 1000IU D3 pill, when i bother, to keep my throat working more than anything.
my cal-mag pills (they have zinc as well) are just jamieson brand that were around the house anyway,
sorry, i dont feel like that was very helpful!! i will look into the ratio info more when this semester is over. hectic.