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Finding the Fourth Proportional to 217.47, 326.21 and 55.15

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Solution

The fourth proportional to 217.47, 326.21 and 55.15 is: 82.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.47 : 326.21 = 55.15 : x
  2. Step 2: Convert to fraction form
    217.47/326.21 = 55.15/x
  3. Step 3: Cross multiply
    217.47x = 326.21 × 55.15
  4. Step 4: Simplify right side
    217.47x = 17,990.48
  5. Step 5: Solve for x
    x = 17,990.48/217.47
  6. Step 6: Final answer
    x = 82.73

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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.