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Finding the Fourth Proportional to 3,893.78, 5,839.31 and 1,260.81

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Solution

The fourth proportional to 3,893.78, 5,839.31 and 1,260.81 is: 1,890.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,893.78 : 5,839.31 = 1,260.81 : x
  2. Step 2: Convert to fraction form
    3,893.78/5,839.31 = 1,260.81/x
  3. Step 3: Cross multiply
    3,893.78x = 5,839.31 × 1,260.81
  4. Step 4: Simplify right side
    3,893.78x = 7,362,254.14
  5. Step 5: Solve for x
    x = 7,362,254.14/3,893.78
  6. Step 6: Final answer
    x = 1,890.78

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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.