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Finding the Fourth Proportional to 682.20, 1,023.48 and 422.28

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Solution

The fourth proportional to 682.20, 1,023.48 and 422.28 is: 633.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.20 : 1,023.48 = 422.28 : x
  2. Step 2: Convert to fraction form
    682.20/1,023.48 = 422.28/x
  3. Step 3: Cross multiply
    682.20x = 1,023.48 × 422.28
  4. Step 4: Simplify right side
    682.20x = 432,195.13
  5. Step 5: Solve for x
    x = 432,195.13/682.20
  6. Step 6: Final answer
    x = 633.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.