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Finding the Fourth Proportional to 18,963.14, 28,445.82 and 5,815.64

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Solution

The fourth proportional to 18,963.14, 28,445.82 and 5,815.64 is: 8,723.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,963.14 : 28,445.82 = 5,815.64 : x
  2. Step 2: Convert to fraction form
    18,963.14/28,445.82 = 5,815.64/x
  3. Step 3: Cross multiply
    18,963.14x = 28,445.82 × 5,815.64
  4. Step 4: Simplify right side
    18,963.14x = 165,430,648.62
  5. Step 5: Solve for x
    x = 165,430,648.62/18,963.14
  6. Step 6: Final answer
    x = 8,723.80

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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.