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Finding the Fourth Proportional to 258,418.40, 387,627.60 and 80,979.80

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Solution

The fourth proportional to 258,418.40, 387,627.60 and 80,979.80 is: 121,469.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,418.40 : 387,627.60 = 80,979.80 : x
  2. Step 2: Convert to fraction form
    258,418.40/387,627.60 = 80,979.80/x
  3. Step 3: Cross multiply
    258,418.40x = 387,627.60 × 80,979.80
  4. Step 4: Simplify right side
    258,418.40x = 31,390,005,522.48
  5. Step 5: Solve for x
    x = 31,390,005,522.48/258,418.40
  6. Step 6: Final answer
    x = 121,469.70

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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.