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Finding the Fourth Proportional to 682.20, 1,021.68 and 487.44

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Solution

The fourth proportional to 682.20, 1,021.68 and 487.44 is: 730.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.20 : 1,021.68 = 487.44 : x
  2. Step 2: Convert to fraction form
    682.20/1,021.68 = 487.44/x
  3. Step 3: Cross multiply
    682.20x = 1,021.68 × 487.44
  4. Step 4: Simplify right side
    682.20x = 498,007.70
  5. Step 5: Solve for x
    x = 498,007.70/682.20
  6. Step 6: Final answer
    x = 730.00

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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.