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Finding the Fourth Proportional to 8,658.39, 12,987.69 and 3,115.70

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Solution

The fourth proportional to 8,658.39, 12,987.69 and 3,115.70 is: 4,673.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.39 : 12,987.69 = 3,115.70 : x
  2. Step 2: Convert to fraction form
    8,658.39/12,987.69 = 3,115.70/x
  3. Step 3: Cross multiply
    8,658.39x = 12,987.69 × 3,115.70
  4. Step 4: Simplify right side
    8,658.39x = 40,465,745.73
  5. Step 5: Solve for x
    x = 40,465,745.73/8,658.39
  6. Step 6: Final answer
    x = 4,673.59

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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.