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Finding the Fourth Proportional to 8,612.87, 12,921.12 and 3,067.91

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Solution

The fourth proportional to 8,612.87, 12,921.12 and 3,067.91 is: 4,602.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,612.87 : 12,921.12 = 3,067.91 : x
  2. Step 2: Convert to fraction form
    8,612.87/12,921.12 = 3,067.91/x
  3. Step 3: Cross multiply
    8,612.87x = 12,921.12 × 3,067.91
  4. Step 4: Simplify right side
    8,612.87x = 39,640,817.11
  5. Step 5: Solve for x
    x = 39,640,817.11/8,612.87
  6. Step 6: Final answer
    x = 4,602.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.