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Finding the Fourth Proportional to 20,487.60, 30,731.40 and 18,081.90

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Solution

The fourth proportional to 20,487.60, 30,731.40 and 18,081.90 is: 27,122.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.60 : 30,731.40 = 18,081.90 : x
  2. Step 2: Convert to fraction form
    20,487.60/30,731.40 = 18,081.90/x
  3. Step 3: Cross multiply
    20,487.60x = 30,731.40 × 18,081.90
  4. Step 4: Simplify right side
    20,487.60x = 555,682,101.66
  5. Step 5: Solve for x
    x = 555,682,101.66/20,487.60
  6. Step 6: Final answer
    x = 27,122.85

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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.