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Finding the Fourth Proportional to 258,591.34, 387,887.48 and 81,112.11

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Solution

The fourth proportional to 258,591.34, 387,887.48 and 81,112.11 is: 121,668.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,591.34 : 387,887.48 = 81,112.11 : x
  2. Step 2: Convert to fraction form
    258,591.34/387,887.48 = 81,112.11/x
  3. Step 3: Cross multiply
    258,591.34x = 387,887.48 × 81,112.11
  4. Step 4: Simplify right side
    258,591.34x = 31,462,371,945.38
  5. Step 5: Solve for x
    x = 31,462,371,945.38/258,591.34
  6. Step 6: Final answer
    x = 121,668.31

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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.