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Finding the Fourth Proportional to 258,207.60, 387,311.40 and 71,218.80

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Solution

The fourth proportional to 258,207.60, 387,311.40 and 71,218.80 is: 106,828.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,207.60 : 387,311.40 = 71,218.80 : x
  2. Step 2: Convert to fraction form
    258,207.60/387,311.40 = 71,218.80/x
  3. Step 3: Cross multiply
    258,207.60x = 387,311.40 × 71,218.80
  4. Step 4: Simplify right side
    258,207.60x = 27,583,853,134.32
  5. Step 5: Solve for x
    x = 27,583,853,134.32/258,207.60
  6. Step 6: Final answer
    x = 106,828.20

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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.