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Finding the Fourth Proportional to 371.39, 557.27 and 217.61

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Solution

The fourth proportional to 371.39, 557.27 and 217.61 is: 326.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.39 : 557.27 = 217.61 : x
  2. Step 2: Convert to fraction form
    371.39/557.27 = 217.61/x
  3. Step 3: Cross multiply
    371.39x = 557.27 × 217.61
  4. Step 4: Simplify right side
    371.39x = 121,269.46
  5. Step 5: Solve for x
    x = 121,269.46/371.39
  6. Step 6: Final answer
    x = 326.53

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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.