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Finding the Fourth Proportional to 308.68, 462.80 and 217.56

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Solution

The fourth proportional to 308.68, 462.80 and 217.56 is: 326.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.68 : 462.80 = 217.56 : x
  2. Step 2: Convert to fraction form
    308.68/462.80 = 217.56/x
  3. Step 3: Cross multiply
    308.68x = 462.80 × 217.56
  4. Step 4: Simplify right side
    308.68x = 100,686.77
  5. Step 5: Solve for x
    x = 100,686.77/308.68
  6. Step 6: Final answer
    x = 326.18

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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.