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Finding the Fourth Proportional to 13,658.88, 20,481.84 and 7,078.44

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Solution

The fourth proportional to 13,658.88, 20,481.84 and 7,078.44 is: 10,614.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,658.88 : 20,481.84 = 7,078.44 : x
  2. Step 2: Convert to fraction form
    13,658.88/20,481.84 = 7,078.44/x
  3. Step 3: Cross multiply
    13,658.88x = 20,481.84 × 7,078.44
  4. Step 4: Simplify right side
    13,658.88x = 144,979,475.53
  5. Step 5: Solve for x
    x = 144,979,475.53/13,658.88
  6. Step 6: Final answer
    x = 10,614.30

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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.