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Jim, I can't tell ya what the ratios are... But Dad always mixed the cement when we would run concrete. We have a small mixer that has been around since the early '50s. He would divide a bag of cement into thirds {he would use 5 gallon buckets and fill them to equal proportions}. One bucket was used per batch. We had a certain medium sized, rounded, gravel shovel that we always used {he always said that he couldn't mix cement without that shovel}. And we used a small sized milk bucket to measure the water. {While the mixer is running} - I would put 3/4 (or slightly more) of a bucket of water into the mixer and then shovel 3 scoops of sand/gravel mixture in {the gravel pit would blend the sand/gravel proportions for us}. Then Dad would shake one bucket (1/3 of a bag) full of cement "powder" into the mixer {do not add all the cement in at one time or you get big clumps or lumps of powder that do not mix well}. Then I would add 6 more scoops of sand/gravel mix. Then, as the mixer mixed the batch I would add just a small amount of water as needed {and believe me that a cup of water goes a long way! It doesn't take much water to go from too thick... to soup!} I know that this does not help much because the measurements are vague... but it is fun for me to remember these things! Oh yea... I almost forgot, we used a tub or barrel to "dip" the water bucket full... when running multiple batches. That way the water was readily available and we would not have to wait for each small bucket of water to fill from a hose while mixing. If you were to call a gravel pit, they most likely could tell you the different sand/gravel ratio mixtures {there are different percentages for different projects} and/or... they would just mix you a p/u truck load. Good luck!
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Rod