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Finding the Fourth Proportional to 258,553.58, 387,819.09 and 81,056.54

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Solution

The fourth proportional to 258,553.58, 387,819.09 and 81,056.54 is: 121,581.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,553.58 : 387,819.09 = 81,056.54 : x
  2. Step 2: Convert to fraction form
    258,553.58/387,819.09 = 81,056.54/x
  3. Step 3: Cross multiply
    258,553.58x = 387,819.09 × 81,056.54
  4. Step 4: Simplify right side
    258,553.58x = 31,435,273,581.35
  5. Step 5: Solve for x
    x = 31,435,273,581.35/258,553.58
  6. Step 6: Final answer
    x = 121,581.27

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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.