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Finding the Fourth Proportional to 258,520.77, 387,786.02 and 81,023.85

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Solution

The fourth proportional to 258,520.77, 387,786.02 and 81,023.85 is: 121,537.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,520.77 : 387,786.02 = 81,023.85 : x
  2. Step 2: Convert to fraction form
    258,520.77/387,786.02 = 81,023.85/x
  3. Step 3: Cross multiply
    258,520.77x = 387,786.02 × 81,023.85
  4. Step 4: Simplify right side
    258,520.77x = 31,419,915,911.46
  5. Step 5: Solve for x
    x = 31,419,915,911.46/258,520.77
  6. Step 6: Final answer
    x = 121,537.30

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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.