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Finding the Fourth Proportional to 6,422.20, 8,865.42 and 3,905.10

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Solution

The fourth proportional to 6,422.20, 8,865.42 and 3,905.10 is: 5,390.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,422.20 : 8,865.42 = 3,905.10 : x
  2. Step 2: Convert to fraction form
    6,422.20/8,865.42 = 3,905.10/x
  3. Step 3: Cross multiply
    6,422.20x = 8,865.42 × 3,905.10
  4. Step 4: Simplify right side
    6,422.20x = 34,620,351.64
  5. Step 5: Solve for x
    x = 34,620,351.64/6,422.20
  6. Step 6: Final answer
    x = 5,390.73

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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.