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Finding the Fourth Proportional to 13,610.40, 20,399.40 and 5,712.90

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Solution

The fourth proportional to 13,610.40, 20,399.40 and 5,712.90 is: 8,562.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,610.40 : 20,399.40 = 5,712.90 : x
  2. Step 2: Convert to fraction form
    13,610.40/20,399.40 = 5,712.90/x
  3. Step 3: Cross multiply
    13,610.40x = 20,399.40 × 5,712.90
  4. Step 4: Simplify right side
    13,610.40x = 116,539,732.26
  5. Step 5: Solve for x
    x = 116,539,732.26/13,610.40
  6. Step 6: Final answer
    x = 8,562.55

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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.