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Finding the Fourth Proportional to 217.85, 326.78 and 96.20

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Solution

The fourth proportional to 217.85, 326.78 and 96.20 is: 144.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.85 : 326.78 = 96.20 : x
  2. Step 2: Convert to fraction form
    217.85/326.78 = 96.20/x
  3. Step 3: Cross multiply
    217.85x = 326.78 × 96.20
  4. Step 4: Simplify right side
    217.85x = 31,436.10
  5. Step 5: Solve for x
    x = 31,436.10/217.85
  6. Step 6: Final answer
    x = 144.30

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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.