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Finding the Fourth Proportional to 411,379.20, 618,105.60 and 261,691.20

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Solution

The fourth proportional to 411,379.20, 618,105.60 and 261,691.20 is: 393,196.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,379.20 : 618,105.60 = 261,691.20 : x
  2. Step 2: Convert to fraction form
    411,379.20/618,105.60 = 261,691.20/x
  3. Step 3: Cross multiply
    411,379.20x = 618,105.60 × 261,691.20
  4. Step 4: Simplify right side
    411,379.20x = 161,752,796,190.72
  5. Step 5: Solve for x
    x = 161,752,796,190.72/411,379.20
  6. Step 6: Final answer
    x = 393,196.34

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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.