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Finding the Fourth Proportional to 355.13, 531.92 and 217.77

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Solution

The fourth proportional to 355.13, 531.92 and 217.77 is: 326.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.13 : 531.92 = 217.77 : x
  2. Step 2: Convert to fraction form
    355.13/531.92 = 217.77/x
  3. Step 3: Cross multiply
    355.13x = 531.92 × 217.77
  4. Step 4: Simplify right side
    355.13x = 115,834.77
  5. Step 5: Solve for x
    x = 115,834.77/355.13
  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.