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Finding the Third Proportional to 153.38 and 217.88

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Solution

The third proportional to 153.38 and 217.88 is: 309.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.38 : 217.88 = 217.88 : x
  2. Step 2: Convert to fraction form
    153.38/217.88 = 217.88/x
  3. Step 3: Cross multiply
    153.38x = 217.88 × 217.88
  4. Step 4: Simplify right side
    153.38x = 47,469.52
  5. Step 5: Solve for x
    x = 47,469.52/153.38
  6. Step 6: Final answer
    x = 309.50

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.