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Finding the Fourth Proportional to 6,406.55, 8,839.69 and 3,889.99

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Solution

The fourth proportional to 6,406.55, 8,839.69 and 3,889.99 is: 5,367.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,406.55 : 8,839.69 = 3,889.99 : x
  2. Step 2: Convert to fraction form
    6,406.55/8,839.69 = 3,889.99/x
  3. Step 3: Cross multiply
    6,406.55x = 8,839.69 × 3,889.99
  4. Step 4: Simplify right side
    6,406.55x = 34,386,305.70
  5. Step 5: Solve for x
    x = 34,386,305.70/6,406.55
  6. Step 6: Final answer
    x = 5,367.37

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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.