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Finding the Fourth Proportional to 613,791.90, 919,132.65 and 489,375.90

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Solution

The fourth proportional to 613,791.90, 919,132.65 and 489,375.90 is: 732,823.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,791.90 : 919,132.65 = 489,375.90 : x
  2. Step 2: Convert to fraction form
    613,791.90/919,132.65 = 489,375.90/x
  3. Step 3: Cross multiply
    613,791.90x = 919,132.65 × 489,375.90
  4. Step 4: Simplify right side
    613,791.90x = 449,801,367,813.14
  5. Step 5: Solve for x
    x = 449,801,367,813.14/613,791.90
  6. Step 6: Final answer
    x = 732,823.89

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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.