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Finding the Fourth Proportional to 389,608.80, 584,413.20 and 249,640.80

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Solution

The fourth proportional to 389,608.80, 584,413.20 and 249,640.80 is: 374,461.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,608.80 : 584,413.20 = 249,640.80 : x
  2. Step 2: Convert to fraction form
    389,608.80/584,413.20 = 249,640.80/x
  3. Step 3: Cross multiply
    389,608.80x = 584,413.20 × 249,640.80
  4. Step 4: Simplify right side
    389,608.80x = 145,893,378,778.56
  5. Step 5: Solve for x
    x = 145,893,378,778.56/389,608.80
  6. Step 6: Final answer
    x = 374,461.20

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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.