Without using actual figures we can look at the problem algebraically.
If P=total population of the States, W=population of “whites”, B=population of “blacks”, O=population of “others”, including indigenous Americans, P=W+B+O. If D(W) represents the number of deaths of whites in police custody and D(B) that of blacks under the same circumstances (excludes those whose deaths were not caused directly by one or more law enforcement officers), then the proportion of such deaths relative to the populations of the two groups would be D(W)/W and D(B)/B. If r is the multiplication factor such that D(B)/B=rD(W)/W and W-B=160m (160 million) then we can replace W with B+160m:
D(B)/B=rD(W)/(B+160m).
Total such deaths=D(B)+D(W). D(W)=0.49(D(B)+D(W)), D(B)=0.24(D(B)+D(W)).
Therefore, 0.24(D(B)+D(W))/B=0.49r(D(B)+D(W))/(B+160m), 0.24/B=0.49r/(B+160m).
0.24(B+160m)=0.49rB, 38.4m=B(0.49r-0.24).
To find r we need to know B. P=329m approx, and B=0.13P=42.8m approx.
0.49r-0.24=38.4/42.8, r=(38.4/42.8+0.24)/0.49=2.32 approx.