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Finding the Fourth Proportional to 20,388.87, 30,576.02 and 11,035.80

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Solution

The fourth proportional to 20,388.87, 30,576.02 and 11,035.80 is: 16,549.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.87 : 30,576.02 = 11,035.80 : x
  2. Step 2: Convert to fraction form
    20,388.87/30,576.02 = 11,035.80/x
  3. Step 3: Cross multiply
    20,388.87x = 30,576.02 × 11,035.80
  4. Step 4: Simplify right side
    20,388.87x = 337,430,786.34
  5. Step 5: Solve for x
    x = 337,430,786.34/20,388.87
  6. Step 6: Final answer
    x = 16,549.75

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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.