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Finding the Fourth Proportional to 682.79, 1,024.09 and 220.55

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Solution

The fourth proportional to 682.79, 1,024.09 and 220.55 is: 330.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.79 : 1,024.09 = 220.55 : x
  2. Step 2: Convert to fraction form
    682.79/1,024.09 = 220.55/x
  3. Step 3: Cross multiply
    682.79x = 1,024.09 × 220.55
  4. Step 4: Simplify right side
    682.79x = 225,863.05
  5. Step 5: Solve for x
    x = 225,863.05/682.79
  6. Step 6: Final answer
    x = 330.79

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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.