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Finding the Fourth Proportional to 461.22, 691.38 and 217.68

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Solution

The fourth proportional to 461.22, 691.38 and 217.68 is: 326.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.22 : 691.38 = 217.68 : x
  2. Step 2: Convert to fraction form
    461.22/691.38 = 217.68/x
  3. Step 3: Cross multiply
    461.22x = 691.38 × 217.68
  4. Step 4: Simplify right side
    461.22x = 150,499.60
  5. Step 5: Solve for x
    x = 150,499.60/461.22
  6. Step 6: Final answer
    x = 326.31

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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.