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Finding the Fourth Proportional to 217.95, 327.02 and 115.31

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Solution

The fourth proportional to 217.95, 327.02 and 115.31 is: 173.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.95 : 327.02 = 115.31 : x
  2. Step 2: Convert to fraction form
    217.95/327.02 = 115.31/x
  3. Step 3: Cross multiply
    217.95x = 327.02 × 115.31
  4. Step 4: Simplify right side
    217.95x = 37,708.68
  5. Step 5: Solve for x
    x = 37,708.68/217.95
  6. Step 6: Final answer
    x = 173.02

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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.