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Finding the Fourth Proportional to 3,856.60, 5,785.50 and 1,391.92

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Solution

The fourth proportional to 3,856.60, 5,785.50 and 1,391.92 is: 2,088.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,856.60 : 5,785.50 = 1,391.92 : x
  2. Step 2: Convert to fraction form
    3,856.60/5,785.50 = 1,391.92/x
  3. Step 3: Cross multiply
    3,856.60x = 5,785.50 × 1,391.92
  4. Step 4: Simplify right side
    3,856.60x = 8,052,953.16
  5. Step 5: Solve for x
    x = 8,052,953.16/3,856.60
  6. Step 6: Final answer
    x = 2,088.10

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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.