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Finding the Fourth Proportional to 258,589.52, 387,888.36 and 81,098.07

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Solution

The fourth proportional to 258,589.52, 387,888.36 and 81,098.07 is: 121,648.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,589.52 : 387,888.36 = 81,098.07 : x
  2. Step 2: Convert to fraction form
    258,589.52/387,888.36 = 81,098.07/x
  3. Step 3: Cross multiply
    258,589.52x = 387,888.36 × 81,098.07
  4. Step 4: Simplify right side
    258,589.52x = 31,456,997,371.47
  5. Step 5: Solve for x
    x = 31,456,997,371.47/258,589.52
  6. Step 6: Final answer
    x = 121,648.38

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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.