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Finding the Third Proportional to 217.50 and 261.50

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Solution

The third proportional to 217.50 and 261.50 is: 314.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.50 : 261.50 = 261.50 : x
  2. Step 2: Convert to fraction form
    217.50/261.50 = 261.50/x
  3. Step 3: Cross multiply
    217.50x = 261.50 × 261.50
  4. Step 4: Simplify right side
    217.50x = 68,382.25
  5. Step 5: Solve for x
    x = 68,382.25/217.50
  6. Step 6: Final answer
    x = 314.40

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Why These Related Problems?

These problems maintain the same ratio (1.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.