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Finding the Fourth Proportional to 217.70, 326.09 and 202.21

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Solution

The fourth proportional to 217.70, 326.09 and 202.21 is: 302.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.70 : 326.09 = 202.21 : x
  2. Step 2: Convert to fraction form
    217.70/326.09 = 202.21/x
  3. Step 3: Cross multiply
    217.70x = 326.09 × 202.21
  4. Step 4: Simplify right side
    217.70x = 65,938.66
  5. Step 5: Solve for x
    x = 65,938.66/217.70
  6. Step 6: Final answer
    x = 302.89

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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.