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Finding the Third Proportional to 208.55 and 261.42

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Solution

The third proportional to 208.55 and 261.42 is: 327.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.55 : 261.42 = 261.42 : x
  2. Step 2: Convert to fraction form
    208.55/261.42 = 261.42/x
  3. Step 3: Cross multiply
    208.55x = 261.42 × 261.42
  4. Step 4: Simplify right side
    208.55x = 68,341.40
  5. Step 5: Solve for x
    x = 68,341.40/208.55
  6. Step 6: Final answer
    x = 327.70

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Why These Related Problems?

These problems maintain the same ratio (1.25) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.