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Finding the Fourth Proportional to 139,855.62, 209,691.51 and 67,789.45

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Solution

The fourth proportional to 139,855.62, 209,691.51 and 67,789.45 is: 101,639.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,855.62 : 209,691.51 = 67,789.45 : x
  2. Step 2: Convert to fraction form
    139,855.62/209,691.51 = 67,789.45/x
  3. Step 3: Cross multiply
    139,855.62x = 209,691.51 × 67,789.45
  4. Step 4: Simplify right side
    139,855.62x = 14,214,872,132.57
  5. Step 5: Solve for x
    x = 14,214,872,132.57/139,855.62
  6. Step 6: Final answer
    x = 101,639.62

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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.