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Finding the Fourth Proportional to 128,468.40, 192,702.60 and 81,229.20

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Solution

The fourth proportional to 128,468.40, 192,702.60 and 81,229.20 is: 121,843.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,468.40 : 192,702.60 = 81,229.20 : x
  2. Step 2: Convert to fraction form
    128,468.40/192,702.60 = 81,229.20/x
  3. Step 3: Cross multiply
    128,468.40x = 192,702.60 × 81,229.20
  4. Step 4: Simplify right side
    128,468.40x = 15,653,078,035.92
  5. Step 5: Solve for x
    x = 15,653,078,035.92/128,468.40
  6. Step 6: Final answer
    x = 121,843.80

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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.