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Finding the Fourth Proportional to 86,004.40, 128,787.90 and 82,067.80

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Solution

The fourth proportional to 86,004.40, 128,787.90 and 82,067.80 is: 122,893.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,004.40 : 128,787.90 = 82,067.80 : x
  2. Step 2: Convert to fraction form
    86,004.40/128,787.90 = 82,067.80/x
  3. Step 3: Cross multiply
    86,004.40x = 128,787.90 × 82,067.80
  4. Step 4: Simplify right side
    86,004.40x = 10,569,339,619.62
  5. Step 5: Solve for x
    x = 10,569,339,619.62/86,004.40
  6. Step 6: Final answer
    x = 122,893.01

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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.