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Finding the Fourth Proportional to 139,197.66, 208,656.33 and 80,015.58

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Solution

The fourth proportional to 139,197.66, 208,656.33 and 80,015.58 is: 119,942.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,197.66 : 208,656.33 = 80,015.58 : x
  2. Step 2: Convert to fraction form
    139,197.66/208,656.33 = 80,015.58/x
  3. Step 3: Cross multiply
    139,197.66x = 208,656.33 × 80,015.58
  4. Step 4: Simplify right side
    139,197.66x = 16,695,757,265.62
  5. Step 5: Solve for x
    x = 16,695,757,265.62/139,197.66
  6. Step 6: Final answer
    x = 119,942.80

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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.