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Finding the Fourth Proportional to 258,231.98, 387,370.29 and 71,243.48

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Solution

The fourth proportional to 258,231.98, 387,370.29 and 71,243.48 is: 106,871.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,231.98 : 387,370.29 = 71,243.48 : x
  2. Step 2: Convert to fraction form
    258,231.98/387,370.29 = 71,243.48/x
  3. Step 3: Cross multiply
    258,231.98x = 387,370.29 × 71,243.48
  4. Step 4: Simplify right side
    258,231.98x = 27,597,607,508.21
  5. Step 5: Solve for x
    x = 27,597,607,508.21/258,231.98
  6. Step 6: Final answer
    x = 106,871.38

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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.