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Finding the Fourth Proportional to 3,856.81, 5,785.52 and 1,391.88

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Solution

The fourth proportional to 3,856.81, 5,785.52 and 1,391.88 is: 2,087.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,856.81 : 5,785.52 = 1,391.88 : x
  2. Step 2: Convert to fraction form
    3,856.81/5,785.52 = 1,391.88/x
  3. Step 3: Cross multiply
    3,856.81x = 5,785.52 × 1,391.88
  4. Step 4: Simplify right side
    3,856.81x = 8,052,742.62
  5. Step 5: Solve for x
    x = 8,052,742.62/3,856.81
  6. Step 6: Final answer
    x = 2,087.93

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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.