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Finding the Fourth Proportional to 9,188.11, 12,660.80 and 8,691.85

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Solution

The fourth proportional to 9,188.11, 12,660.80 and 8,691.85 is: 11,976.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,188.11 : 12,660.80 = 8,691.85 : x
  2. Step 2: Convert to fraction form
    9,188.11/12,660.80 = 8,691.85/x
  3. Step 3: Cross multiply
    9,188.11x = 12,660.80 × 8,691.85
  4. Step 4: Simplify right side
    9,188.11x = 110,045,774.48
  5. Step 5: Solve for x
    x = 110,045,774.48/9,188.11
  6. Step 6: Final answer
    x = 11,976.98

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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.