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Finding the Fourth Proportional to 139,415.72, 209,121.14 and 45,922.28

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Solution

The fourth proportional to 139,415.72, 209,121.14 and 45,922.28 is: 68,882.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,415.72 : 209,121.14 = 45,922.28 : x
  2. Step 2: Convert to fraction form
    139,415.72/209,121.14 = 45,922.28/x
  3. Step 3: Cross multiply
    139,415.72x = 209,121.14 × 45,922.28
  4. Step 4: Simplify right side
    139,415.72x = 9,603,318,614.20
  5. Step 5: Solve for x
    x = 9,603,318,614.20/139,415.72
  6. Step 6: Final answer
    x = 68,882.61

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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.