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Finding the Fourth Proportional to 8,311.76, 12,451.12 and 3,915.88

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Solution

The fourth proportional to 8,311.76, 12,451.12 and 3,915.88 is: 5,866.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,311.76 : 12,451.12 = 3,915.88 : x
  2. Step 2: Convert to fraction form
    8,311.76/12,451.12 = 3,915.88/x
  3. Step 3: Cross multiply
    8,311.76x = 12,451.12 × 3,915.88
  4. Step 4: Simplify right side
    8,311.76x = 48,757,091.79
  5. Step 5: Solve for x
    x = 48,757,091.79/8,311.76
  6. Step 6: Final answer
    x = 5,866.04

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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.