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Finding the Fourth Proportional to 3,857.06, 5,787.76 and 1,393.94

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Solution

The fourth proportional to 3,857.06, 5,787.76 and 1,393.94 is: 2,091.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,857.06 : 5,787.76 = 1,393.94 : x
  2. Step 2: Convert to fraction form
    3,857.06/5,787.76 = 1,393.94/x
  3. Step 3: Cross multiply
    3,857.06x = 5,787.76 × 1,393.94
  4. Step 4: Simplify right side
    3,857.06x = 8,067,790.17
  5. Step 5: Solve for x
    x = 8,067,790.17/3,857.06
  6. Step 6: Final answer
    x = 2,091.69

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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.