Finding the Fourth Proportional to 21,180, 31,770 and 8,868
Calculator
Solution
The fourth proportional to 21,180, 31,770 and 8,868 is: 13,302
Step by Step Solution
- Step 1: Write the proportion equation
21,180 : 31,770 = 8,868 : x - Step 2: Convert to fraction form
21,180/31,770 = 8,868/x - Step 3: Cross multiply
21,180x = 31,770 × 8,868 - Step 4: Simplify right side
21,180x = 281,736,360 - Step 5: Solve for x
x = 281,736,360/21,180 - Step 6: Final answer
x = 13,302
Related Problems
Find fourth proportional to 10,590, 15,885 and 4,434
Half scale
Find fourth proportional to 42,360, 63,540 and 17,736
Double scale
Find fourth proportional to 21,181, 31,771.50 and 8,869
Similar ratio
Find fourth proportional to 31,770, 47,655 and 13,302
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.