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Finding the Fourth Proportional to 8,658.55, 12,986.11 and 4,273.21

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Solution

The fourth proportional to 8,658.55, 12,986.11 and 4,273.21 is: 6,408.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.55 : 12,986.11 = 4,273.21 : x
  2. Step 2: Convert to fraction form
    8,658.55/12,986.11 = 4,273.21/x
  3. Step 3: Cross multiply
    8,658.55x = 12,986.11 × 4,273.21
  4. Step 4: Simplify right side
    8,658.55x = 55,492,375.11
  5. Step 5: Solve for x
    x = 55,492,375.11/8,658.55
  6. Step 6: Final answer
    x = 6,408.97

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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.