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Finding the Fourth Proportional to 217.90, 326.71 and 80.93

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Solution

The fourth proportional to 217.90, 326.71 and 80.93 is: 121.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.90 : 326.71 = 80.93 : x
  2. Step 2: Convert to fraction form
    217.90/326.71 = 80.93/x
  3. Step 3: Cross multiply
    217.90x = 326.71 × 80.93
  4. Step 4: Simplify right side
    217.90x = 26,440.64
  5. Step 5: Solve for x
    x = 26,440.64/217.90
  6. Step 6: Final answer
    x = 121.34

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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.