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Finding the Fourth Proportional to 139,007.40, 208,511.10 and 82,910.85

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Solution

The fourth proportional to 139,007.40, 208,511.10 and 82,910.85 is: 124,366.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,007.40 : 208,511.10 = 82,910.85 : x
  2. Step 2: Convert to fraction form
    139,007.40/208,511.10 = 82,910.85/x
  3. Step 3: Cross multiply
    139,007.40x = 208,511.10 × 82,910.85
  4. Step 4: Simplify right side
    139,007.40x = 17,287,832,535.44
  5. Step 5: Solve for x
    x = 17,287,832,535.44/139,007.40
  6. Step 6: Final answer
    x = 124,366.28

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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.