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Finding the Fourth Proportional to 139,273.12, 192,198.08 and 81,897.12

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Solution

The fourth proportional to 139,273.12, 192,198.08 and 81,897.12 is: 113,018.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,273.12 : 192,198.08 = 81,897.12 : x
  2. Step 2: Convert to fraction form
    139,273.12/192,198.08 = 81,897.12/x
  3. Step 3: Cross multiply
    139,273.12x = 192,198.08 × 81,897.12
  4. Step 4: Simplify right side
    139,273.12x = 15,740,469,221.53
  5. Step 5: Solve for x
    x = 15,740,469,221.53/139,273.12
  6. Step 6: Final answer
    x = 113,018.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.