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Finding the Fourth Proportional to 6,340.87, 8,749.38 and 3,986.20

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Solution

The fourth proportional to 6,340.87, 8,749.38 and 3,986.20 is: 5,500.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,340.87 : 8,749.38 = 3,986.20 : x
  2. Step 2: Convert to fraction form
    6,340.87/8,749.38 = 3,986.20/x
  3. Step 3: Cross multiply
    6,340.87x = 8,749.38 × 3,986.20
  4. Step 4: Simplify right side
    6,340.87x = 34,876,778.56
  5. Step 5: Solve for x
    x = 34,876,778.56/6,340.87
  6. Step 6: Final answer
    x = 5,500.31

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1.5x scale

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.