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Finding the Fourth Proportional to 5,709.75, 7,879.28 and 3,191.86

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Solution

The fourth proportional to 5,709.75, 7,879.28 and 3,191.86 is: 4,404.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,709.75 : 7,879.28 = 3,191.86 : x
  2. Step 2: Convert to fraction form
    5,709.75/7,879.28 = 3,191.86/x
  3. Step 3: Cross multiply
    5,709.75x = 7,879.28 × 3,191.86
  4. Step 4: Simplify right side
    5,709.75x = 25,149,558.66
  5. Step 5: Solve for x
    x = 25,149,558.66/5,709.75
  6. Step 6: Final answer
    x = 4,404.67

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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.