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Finding the Third Proportional to 121.08 and 261.56

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Solution

The third proportional to 121.08 and 261.56 is: 565.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.08 : 261.56 = 261.56 : x
  2. Step 2: Convert to fraction form
    121.08/261.56 = 261.56/x
  3. Step 3: Cross multiply
    121.08x = 261.56 × 261.56
  4. Step 4: Simplify right side
    121.08x = 68,414.94
  5. Step 5: Solve for x
    x = 68,414.94/121.08
  6. Step 6: Final answer
    x = 565.05

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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.