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Finding the Fourth Proportional to 460.68, 691.17 and 217.21

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Solution

The fourth proportional to 460.68, 691.17 and 217.21 is: 325.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    460.68 : 691.17 = 217.21 : x
  2. Step 2: Convert to fraction form
    460.68/691.17 = 217.21/x
  3. Step 3: Cross multiply
    460.68x = 691.17 × 217.21
  4. Step 4: Simplify right side
    460.68x = 150,129.04
  5. Step 5: Solve for x
    x = 150,129.04/460.68
  6. Step 6: Final answer
    x = 325.89

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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.