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Finding the Fourth Proportional to 8,456.87, 11,671.17 and 4,919.87

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Solution

The fourth proportional to 8,456.87, 11,671.17 and 4,919.87 is: 6,789.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,456.87 : 11,671.17 = 4,919.87 : x
  2. Step 2: Convert to fraction form
    8,456.87/11,671.17 = 4,919.87/x
  3. Step 3: Cross multiply
    8,456.87x = 11,671.17 × 4,919.87
  4. Step 4: Simplify right side
    8,456.87x = 57,420,639.15
  5. Step 5: Solve for x
    x = 57,420,639.15/8,456.87
  6. Step 6: Final answer
    x = 6,789.82

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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.