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Finding the Third Proportional to 220.13 and 308.06

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Solution

The third proportional to 220.13 and 308.06 is: 431.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.13 : 308.06 = 308.06 : x
  2. Step 2: Convert to fraction form
    220.13/308.06 = 308.06/x
  3. Step 3: Cross multiply
    220.13x = 308.06 × 308.06
  4. Step 4: Simplify right side
    220.13x = 94,902.50
  5. Step 5: Solve for x
    x = 94,902.50/220.13
  6. Step 6: Final answer
    x = 431.13

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.