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Finding the Fourth Proportional to 3,859.13, 5,787.81 and 1,086.08

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Solution

The fourth proportional to 3,859.13, 5,787.81 and 1,086.08 is: 1,628.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,859.13 : 5,787.81 = 1,086.08 : x
  2. Step 2: Convert to fraction form
    3,859.13/5,787.81 = 1,086.08/x
  3. Step 3: Cross multiply
    3,859.13x = 5,787.81 × 1,086.08
  4. Step 4: Simplify right side
    3,859.13x = 6,285,995.75
  5. Step 5: Solve for x
    x = 6,285,995.75/3,859.13
  6. Step 6: Final answer
    x = 1,628.87

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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.