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Finding the Fourth Proportional to 139,698.47, 209,400.99 and 68,522.56

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Solution

The fourth proportional to 139,698.47, 209,400.99 and 68,522.56 is: 102,711.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,698.47 : 209,400.99 = 68,522.56 : x
  2. Step 2: Convert to fraction form
    139,698.47/209,400.99 = 68,522.56/x
  3. Step 3: Cross multiply
    139,698.47x = 209,400.99 × 68,522.56
  4. Step 4: Simplify right side
    139,698.47x = 14,348,690,511.72
  5. Step 5: Solve for x
    x = 14,348,690,511.72/139,698.47
  6. Step 6: Final answer
    x = 102,711.87

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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.