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Finding the Fourth Proportional to 258,349.28, 387,531.28 and 71,360.80

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Solution

The fourth proportional to 258,349.28, 387,531.28 and 71,360.80 is: 107,043.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,349.28 : 387,531.28 = 71,360.80 : x
  2. Step 2: Convert to fraction form
    258,349.28/387,531.28 = 71,360.80/x
  3. Step 3: Cross multiply
    258,349.28x = 387,531.28 × 71,360.80
  4. Step 4: Simplify right side
    258,349.28x = 27,654,542,165.82
  5. Step 5: Solve for x
    x = 27,654,542,165.82/258,349.28
  6. Step 6: Final answer
    x = 107,043.23

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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.