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Finding the Fourth Proportional to 258,829.62, 388,337.85 and 90,374.78

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Solution

The fourth proportional to 258,829.62, 388,337.85 and 90,374.78 is: 135,594.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,829.62 : 388,337.85 = 90,374.78 : x
  2. Step 2: Convert to fraction form
    258,829.62/388,337.85 = 90,374.78/x
  3. Step 3: Cross multiply
    258,829.62x = 388,337.85 × 90,374.78
  4. Step 4: Simplify right side
    258,829.62x = 35,095,945,817.73
  5. Step 5: Solve for x
    x = 35,095,945,817.73/258,829.62
  6. Step 6: Final answer
    x = 135,594.78

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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.