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Finding the Fourth Proportional to 8,691.94, 11,994.90 and 5,155.82

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Solution

The fourth proportional to 8,691.94, 11,994.90 and 5,155.82 is: 7,115.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.94 : 11,994.90 = 5,155.82 : x
  2. Step 2: Convert to fraction form
    8,691.94/11,994.90 = 5,155.82/x
  3. Step 3: Cross multiply
    8,691.94x = 11,994.90 × 5,155.82
  4. Step 4: Simplify right side
    8,691.94x = 61,843,545.32
  5. Step 5: Solve for x
    x = 61,843,545.32/8,691.94
  6. Step 6: Final answer
    x = 7,115.05

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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.