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Finding the Fourth Proportional to 139,635.78, 207,874.24 and 138,805.40

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Solution

The fourth proportional to 139,635.78, 207,874.24 and 138,805.40 is: 206,638.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,635.78 : 207,874.24 = 138,805.40 : x
  2. Step 2: Convert to fraction form
    139,635.78/207,874.24 = 138,805.40/x
  3. Step 3: Cross multiply
    139,635.78x = 207,874.24 × 138,805.40
  4. Step 4: Simplify right side
    139,635.78x = 28,854,067,032.90
  5. Step 5: Solve for x
    x = 28,854,067,032.90/139,635.78
  6. Step 6: Final answer
    x = 206,638.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.