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Finding the Fourth Proportional to 5,660.85, 7,811.90 and 3,142.86

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Solution

The fourth proportional to 5,660.85, 7,811.90 and 3,142.86 is: 4,337.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,660.85 : 7,811.90 = 3,142.86 : x
  2. Step 2: Convert to fraction form
    5,660.85/7,811.90 = 3,142.86/x
  3. Step 3: Cross multiply
    5,660.85x = 7,811.90 × 3,142.86
  4. Step 4: Simplify right side
    5,660.85x = 24,551,745.19
  5. Step 5: Solve for x
    x = 24,551,745.19/5,660.85
  6. Step 6: Final answer
    x = 4,337.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.