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Finding the Fourth Proportional to 461.03, 691.40 and 217.55

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Solution

The fourth proportional to 461.03, 691.40 and 217.55 is: 326.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.03 : 691.40 = 217.55 : x
  2. Step 2: Convert to fraction form
    461.03/691.40 = 217.55/x
  3. Step 3: Cross multiply
    461.03x = 691.40 × 217.55
  4. Step 4: Simplify right side
    461.03x = 150,416.34
  5. Step 5: Solve for x
    x = 150,416.34/461.03
  6. Step 6: Final answer
    x = 326.27

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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.