For the problem of calculating the proportional value, please post the formula process, It costs 23000 yuan for the three of them to buy a thing together, 6440 yuan for a, 6900 yuan for B and 9660 yuan for C. what's the correct ratio of the three of them? Please post the answer formula,
A:
A: B: C = 6440:6900:9660 (also divided by 20) = 322:345:483