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Finding the Fourth Proportional to 18,963.31, 28,443.89 and 5,815.64

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Solution

The fourth proportional to 18,963.31, 28,443.89 and 5,815.64 is: 8,723.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,963.31 : 28,443.89 = 5,815.64 : x
  2. Step 2: Convert to fraction form
    18,963.31/28,443.89 = 5,815.64/x
  3. Step 3: Cross multiply
    18,963.31x = 28,443.89 × 5,815.64
  4. Step 4: Simplify right side
    18,963.31x = 165,419,438.98
  5. Step 5: Solve for x
    x = 165,419,438.98/18,963.31
  6. Step 6: Final answer
    x = 8,723.13

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1.5x scale

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.