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Finding the Fourth Proportional to 18,684.56, 28,013.88 and 8,815.52

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Solution

The fourth proportional to 18,684.56, 28,013.88 and 8,815.52 is: 13,217.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,684.56 : 28,013.88 = 8,815.52 : x
  2. Step 2: Convert to fraction form
    18,684.56/28,013.88 = 8,815.52/x
  3. Step 3: Cross multiply
    18,684.56x = 28,013.88 × 8,815.52
  4. Step 4: Simplify right side
    18,684.56x = 246,956,919.42
  5. Step 5: Solve for x
    x = 246,956,919.42/18,684.56
  6. Step 6: Final answer
    x = 13,217.17

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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.