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Finding the Fourth Proportional to 667,712.08, 921,443.60 and 361,791.78

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Solution

The fourth proportional to 667,712.08, 921,443.60 and 361,791.78 is: 499,273.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,712.08 : 921,443.60 = 361,791.78 : x
  2. Step 2: Convert to fraction form
    667,712.08/921,443.60 = 361,791.78/x
  3. Step 3: Cross multiply
    667,712.08x = 921,443.60 × 361,791.78
  4. Step 4: Simplify right side
    667,712.08x = 333,370,718,404.65
  5. Step 5: Solve for x
    x = 333,370,718,404.65/667,712.08
  6. Step 6: Final answer
    x = 499,273.16

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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.