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Finding the Fourth Proportional to 18,922.61, 28,375.11 and 13,635.54

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Solution

The fourth proportional to 18,922.61, 28,375.11 and 13,635.54 is: 20,446.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,922.61 : 28,375.11 = 13,635.54 : x
  2. Step 2: Convert to fraction form
    18,922.61/28,375.11 = 13,635.54/x
  3. Step 3: Cross multiply
    18,922.61x = 28,375.11 × 13,635.54
  4. Step 4: Simplify right side
    18,922.61x = 386,909,947.41
  5. Step 5: Solve for x
    x = 386,909,947.41/18,922.61
  6. Step 6: Final answer
    x = 20,446.96

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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.