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Finding the Fourth Proportional to 682.20, 1,022.40 and 270.96

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Solution

The fourth proportional to 682.20, 1,022.40 and 270.96 is: 406.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.20 : 1,022.40 = 270.96 : x
  2. Step 2: Convert to fraction form
    682.20/1,022.40 = 270.96/x
  3. Step 3: Cross multiply
    682.20x = 1,022.40 × 270.96
  4. Step 4: Simplify right side
    682.20x = 277,029.50
  5. Step 5: Solve for x
    x = 277,029.50/682.20
  6. Step 6: Final answer
    x = 406.08

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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.