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Finding the Fourth Proportional to 139,067.20, 208,600.80 and 85,923.10

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Solution

The fourth proportional to 139,067.20, 208,600.80 and 85,923.10 is: 128,884.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,067.20 : 208,600.80 = 85,923.10 : x
  2. Step 2: Convert to fraction form
    139,067.20/208,600.80 = 85,923.10/x
  3. Step 3: Cross multiply
    139,067.20x = 208,600.80 × 85,923.10
  4. Step 4: Simplify right side
    139,067.20x = 17,923,627,398.48
  5. Step 5: Solve for x
    x = 17,923,627,398.48/139,067.20
  6. Step 6: Final answer
    x = 128,884.65

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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.