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Finding the Fourth Proportional to 20,190.87, 30,285.90 and 9,091.44

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Solution

The fourth proportional to 20,190.87, 30,285.90 and 9,091.44 is: 13,636.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,190.87 : 30,285.90 = 9,091.44 : x
  2. Step 2: Convert to fraction form
    20,190.87/30,285.90 = 9,091.44/x
  3. Step 3: Cross multiply
    20,190.87x = 30,285.90 × 9,091.44
  4. Step 4: Simplify right side
    20,190.87x = 275,342,442.70
  5. Step 5: Solve for x
    x = 275,342,442.70/20,190.87
  6. Step 6: Final answer
    x = 13,636.98

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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.