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Finding the Fourth Proportional to 139,042.85, 208,626.30 and 64,122.78

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Solution

The fourth proportional to 139,042.85, 208,626.30 and 64,122.78 is: 96,212.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,042.85 : 208,626.30 = 64,122.78 : x
  2. Step 2: Convert to fraction form
    139,042.85/208,626.30 = 64,122.78/x
  3. Step 3: Cross multiply
    139,042.85x = 208,626.30 × 64,122.78
  4. Step 4: Simplify right side
    139,042.85x = 13,377,698,337.11
  5. Step 5: Solve for x
    x = 13,377,698,337.11/139,042.85
  6. Step 6: Final answer
    x = 96,212.78

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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.