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Finding the Fourth Proportional to 13,800.87, 20,700.90 and 3,412.62

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Solution

The fourth proportional to 13,800.87, 20,700.90 and 3,412.62 is: 5,118.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,800.87 : 20,700.90 = 3,412.62 : x
  2. Step 2: Convert to fraction form
    13,800.87/20,700.90 = 3,412.62/x
  3. Step 3: Cross multiply
    13,800.87x = 20,700.90 × 3,412.62
  4. Step 4: Simplify right side
    13,800.87x = 70,644,305.36
  5. Step 5: Solve for x
    x = 70,644,305.36/13,800.87
  6. Step 6: Final answer
    x = 5,118.83

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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.