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Finding the Fourth Proportional to 8,691.39, 11,978.06 and 6,173.60

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Solution

The fourth proportional to 8,691.39, 11,978.06 and 6,173.60 is: 8,508.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.39 : 11,978.06 = 6,173.60 : x
  2. Step 2: Convert to fraction form
    8,691.39/11,978.06 = 6,173.60/x
  3. Step 3: Cross multiply
    8,691.39x = 11,978.06 × 6,173.60
  4. Step 4: Simplify right side
    8,691.39x = 73,947,660.46
  5. Step 5: Solve for x
    x = 73,947,660.46/8,691.39
  6. Step 6: Final answer
    x = 8,508.15

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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.