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Finding the Fourth Proportional to 389,487.40, 584,231.10 and 220,942.60

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Solution

The fourth proportional to 389,487.40, 584,231.10 and 220,942.60 is: 331,413.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,487.40 : 584,231.10 = 220,942.60 : x
  2. Step 2: Convert to fraction form
    389,487.40/584,231.10 = 220,942.60/x
  3. Step 3: Cross multiply
    389,487.40x = 584,231.10 × 220,942.60
  4. Step 4: Simplify right side
    389,487.40x = 129,081,538,234.86
  5. Step 5: Solve for x
    x = 129,081,538,234.86/389,487.40
  6. Step 6: Final answer
    x = 331,413.90

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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.