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Finding the Fourth Proportional to 487,939.80, 731,909.70 and 338,640.60

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Solution

The fourth proportional to 487,939.80, 731,909.70 and 338,640.60 is: 507,960.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,939.80 : 731,909.70 = 338,640.60 : x
  2. Step 2: Convert to fraction form
    487,939.80/731,909.70 = 338,640.60/x
  3. Step 3: Cross multiply
    487,939.80x = 731,909.70 × 338,640.60
  4. Step 4: Simplify right side
    487,939.80x = 247,854,339,953.82
  5. Step 5: Solve for x
    x = 247,854,339,953.82/487,939.80
  6. Step 6: Final answer
    x = 507,960.90

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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.