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Finding the Fourth Proportional to 8,691.28, 11,995.62 and 5,156.44

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Solution

The fourth proportional to 8,691.28, 11,995.62 and 5,156.44 is: 7,116.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.28 : 11,995.62 = 5,156.44 : x
  2. Step 2: Convert to fraction form
    8,691.28/11,995.62 = 5,156.44/x
  3. Step 3: Cross multiply
    8,691.28x = 11,995.62 × 5,156.44
  4. Step 4: Simplify right side
    8,691.28x = 61,854,694.79
  5. Step 5: Solve for x
    x = 61,854,694.79/8,691.28
  6. Step 6: Final answer
    x = 7,116.87

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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.