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Finding the Fourth Proportional to 3,911.92, 5,862.48 and 2,811.40

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Solution

The fourth proportional to 3,911.92, 5,862.48 and 2,811.40 is: 4,213.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.92 : 5,862.48 = 2,811.40 : x
  2. Step 2: Convert to fraction form
    3,911.92/5,862.48 = 2,811.40/x
  3. Step 3: Cross multiply
    3,911.92x = 5,862.48 × 2,811.40
  4. Step 4: Simplify right side
    3,911.92x = 16,481,776.27
  5. Step 5: Solve for x
    x = 16,481,776.27/3,911.92
  6. Step 6: Final answer
    x = 4,213.22

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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.