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Finding the Fourth Proportional to 8,115.40, 12,148.80 and 7,634.80

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Solution

The fourth proportional to 8,115.40, 12,148.80 and 7,634.80 is: 11,429.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,115.40 : 12,148.80 = 7,634.80 : x
  2. Step 2: Convert to fraction form
    8,115.40/12,148.80 = 7,634.80/x
  3. Step 3: Cross multiply
    8,115.40x = 12,148.80 × 7,634.80
  4. Step 4: Simplify right side
    8,115.40x = 92,753,658.24
  5. Step 5: Solve for x
    x = 92,753,658.24/8,115.40
  6. Step 6: Final answer
    x = 11,429.34

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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.