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Finding the Third Proportional to 121.31 and 261.75

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Solution

The third proportional to 121.31 and 261.75 is: 564.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.31 : 261.75 = 261.75 : x
  2. Step 2: Convert to fraction form
    121.31/261.75 = 261.75/x
  3. Step 3: Cross multiply
    121.31x = 261.75 × 261.75
  4. Step 4: Simplify right side
    121.31x = 68,513.06
  5. Step 5: Solve for x
    x = 68,513.06/121.31
  6. Step 6: Final answer
    x = 564.77

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.