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Finding the Fourth Proportional to 13,600.99, 20,399.14 and 3,605.81

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Solution

The fourth proportional to 13,600.99, 20,399.14 and 3,605.81 is: 5,408.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,600.99 : 20,399.14 = 3,605.81 : x
  2. Step 2: Convert to fraction form
    13,600.99/20,399.14 = 3,605.81/x
  3. Step 3: Cross multiply
    13,600.99x = 20,399.14 × 3,605.81
  4. Step 4: Simplify right side
    13,600.99x = 73,555,321.01
  5. Step 5: Solve for x
    x = 73,555,321.01/13,600.99
  6. Step 6: Final answer
    x = 5,408.09

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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.