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Finding the Fourth Proportional to 6,622.55, 9,139.90 and 3,969.90

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Solution

The fourth proportional to 6,622.55, 9,139.90 and 3,969.90 is: 5,478.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,622.55 : 9,139.90 = 3,969.90 : x
  2. Step 2: Convert to fraction form
    6,622.55/9,139.90 = 3,969.90/x
  3. Step 3: Cross multiply
    6,622.55x = 9,139.90 × 3,969.90
  4. Step 4: Simplify right side
    6,622.55x = 36,284,489.01
  5. Step 5: Solve for x
    x = 36,284,489.01/6,622.55
  6. Step 6: Final answer
    x = 5,478.93

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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.