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Finding the Fourth Proportional to 18,963.18, 28,443.71 and 5,815.52

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Solution

The fourth proportional to 18,963.18, 28,443.71 and 5,815.52 is: 8,722.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,963.18 : 28,443.71 = 5,815.52 : x
  2. Step 2: Convert to fraction form
    18,963.18/28,443.71 = 5,815.52/x
  3. Step 3: Cross multiply
    18,963.18x = 28,443.71 × 5,815.52
  4. Step 4: Simplify right side
    18,963.18x = 165,414,793.08
  5. Step 5: Solve for x
    x = 165,414,793.08/18,963.18
  6. Step 6: Final answer
    x = 8,722.95

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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.