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Finding the Fourth Proportional to 20,112.70, 30,169.05 and 13,891.90

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Solution

The fourth proportional to 20,112.70, 30,169.05 and 13,891.90 is: 20,837.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,112.70 : 30,169.05 = 13,891.90 : x
  2. Step 2: Convert to fraction form
    20,112.70/30,169.05 = 13,891.90/x
  3. Step 3: Cross multiply
    20,112.70x = 30,169.05 × 13,891.90
  4. Step 4: Simplify right side
    20,112.70x = 419,105,425.70
  5. Step 5: Solve for x
    x = 419,105,425.70/20,112.70
  6. Step 6: Final answer
    x = 20,837.85

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1.5x scale

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.