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Finding the Fourth Proportional to 139,147.11, 208,729.35 and 39,314.97

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Solution

The fourth proportional to 139,147.11, 208,729.35 and 39,314.97 is: 58,974.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,147.11 : 208,729.35 = 39,314.97 : x
  2. Step 2: Convert to fraction form
    139,147.11/208,729.35 = 39,314.97/x
  3. Step 3: Cross multiply
    139,147.11x = 208,729.35 × 39,314.97
  4. Step 4: Simplify right side
    139,147.11x = 8,206,188,133.37
  5. Step 5: Solve for x
    x = 8,206,188,133.37/139,147.11
  6. Step 6: Final answer
    x = 58,974.91

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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.