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Finding the Fourth Proportional to 8,658.60, 12,986.10 and 3,728.40

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Solution

The fourth proportional to 8,658.60, 12,986.10 and 3,728.40 is: 5,591.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.60 : 12,986.10 = 3,728.40 : x
  2. Step 2: Convert to fraction form
    8,658.60/12,986.10 = 3,728.40/x
  3. Step 3: Cross multiply
    8,658.60x = 12,986.10 × 3,728.40
  4. Step 4: Simplify right side
    8,658.60x = 48,417,375.24
  5. Step 5: Solve for x
    x = 48,417,375.24/8,658.60
  6. Step 6: Final answer
    x = 5,591.82

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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.