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Finding the Fourth Proportional to 680.26, 1,020.46 and 217.92

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Solution

The fourth proportional to 680.26, 1,020.46 and 217.92 is: 326.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.26 : 1,020.46 = 217.92 : x
  2. Step 2: Convert to fraction form
    680.26/1,020.46 = 217.92/x
  3. Step 3: Cross multiply
    680.26x = 1,020.46 × 217.92
  4. Step 4: Simplify right side
    680.26x = 222,377.55
  5. Step 5: Solve for x
    x = 222,377.55/680.26
  6. Step 6: Final answer
    x = 326.90

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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.