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Finding the Fourth Proportional to 87,286.40, 130,929.60 and 81,454.40

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Solution

The fourth proportional to 87,286.40, 130,929.60 and 81,454.40 is: 122,181.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,286.40 : 130,929.60 = 81,454.40 : x
  2. Step 2: Convert to fraction form
    87,286.40/130,929.60 = 81,454.40/x
  3. Step 3: Cross multiply
    87,286.40x = 130,929.60 × 81,454.40
  4. Step 4: Simplify right side
    87,286.40x = 10,664,792,010.24
  5. Step 5: Solve for x
    x = 10,664,792,010.24/87,286.40
  6. Step 6: Final answer
    x = 122,181.60

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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.