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Finding the Fourth Proportional to 3,857.94, 5,787.45 and 1,260.81

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Solution

The fourth proportional to 3,857.94, 5,787.45 and 1,260.81 is: 1,891.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,857.94 : 5,787.45 = 1,260.81 : x
  2. Step 2: Convert to fraction form
    3,857.94/5,787.45 = 1,260.81/x
  3. Step 3: Cross multiply
    3,857.94x = 5,787.45 × 1,260.81
  4. Step 4: Simplify right side
    3,857.94x = 7,296,874.83
  5. Step 5: Solve for x
    x = 7,296,874.83/3,857.94
  6. Step 6: Final answer
    x = 1,891.39

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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.