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Finding the Fourth Proportional to 308.66, 463.39 and 217.40

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Solution

The fourth proportional to 308.66, 463.39 and 217.40 is: 326.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.66 : 463.39 = 217.40 : x
  2. Step 2: Convert to fraction form
    308.66/463.39 = 217.40/x
  3. Step 3: Cross multiply
    308.66x = 463.39 × 217.40
  4. Step 4: Simplify right side
    308.66x = 100,738.67
  5. Step 5: Solve for x
    x = 100,738.67/308.66
  6. Step 6: Final answer
    x = 326.38

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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.