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Finding the Fourth Proportional to 18,928.76, 28,404.06 and 8,540.50

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Solution

The fourth proportional to 18,928.76, 28,404.06 and 8,540.50 is: 12,815.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928.76 : 28,404.06 = 8,540.50 : x
  2. Step 2: Convert to fraction form
    18,928.76/28,404.06 = 8,540.50/x
  3. Step 3: Cross multiply
    18,928.76x = 28,404.06 × 8,540.50
  4. Step 4: Simplify right side
    18,928.76x = 242,584,874.43
  5. Step 5: Solve for x
    x = 242,584,874.43/18,928.76
  6. Step 6: Final answer
    x = 12,815.68

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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.