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Finding the Fourth Proportional to 308.60, 462.89 and 217.47

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Solution

The fourth proportional to 308.60, 462.89 and 217.47 is: 326.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.60 : 462.89 = 217.47 : x
  2. Step 2: Convert to fraction form
    308.60/462.89 = 217.47/x
  3. Step 3: Cross multiply
    308.60x = 462.89 × 217.47
  4. Step 4: Simplify right side
    308.60x = 100,665.23
  5. Step 5: Solve for x
    x = 100,665.23/308.60
  6. Step 6: Final answer
    x = 326.21

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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.