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Finding the Fourth Proportional to 8,691.76, 12,000.38 and 5,385.52

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Solution

The fourth proportional to 8,691.76, 12,000.38 and 5,385.52 is: 7,435.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.76 : 12,000.38 = 5,385.52 : x
  2. Step 2: Convert to fraction form
    8,691.76/12,000.38 = 5,385.52/x
  3. Step 3: Cross multiply
    8,691.76x = 12,000.38 × 5,385.52
  4. Step 4: Simplify right side
    8,691.76x = 64,628,286.50
  5. Step 5: Solve for x
    x = 64,628,286.50/8,691.76
  6. Step 6: Final answer
    x = 7,435.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.