Finding the Fourth Proportional to 391,128.75, 539,757.68 and 212,280.75
Calculator
Solution
The fourth proportional to 391,128.75, 539,757.68 and 212,280.75 is: 292,947.44
Step by Step Solution
- Step 1: Write the proportion equation
391,128.75 : 539,757.68 = 212,280.75 : x - Step 2: Convert to fraction form
391,128.75/539,757.68 = 212,280.75/x - Step 3: Cross multiply
391,128.75x = 539,757.68 × 212,280.75 - Step 4: Simplify right side
391,128.75x = 114,580,164,067.26 - Step 5: Solve for x
x = 114,580,164,067.26/391,128.75 - Step 6: Final answer
x = 292,947.44
Related Problems
Find fourth proportional to 195,564.38, 269,878.84 and 106,140.38
Half scale
Find fourth proportional to 782,257.50, 1,079,515.35 and 424,561.50
Double scale
Find fourth proportional to 391,129.75, 539,759.06 and 212,281.75
Similar ratio
Find fourth proportional to 586,693.13, 809,636.51 and 318,421.13
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.