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Finding the Third Proportional to 221.44 and 308.06

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Solution

The third proportional to 221.44 and 308.06 is: 428.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.44 : 308.06 = 308.06 : x
  2. Step 2: Convert to fraction form
    221.44/308.06 = 308.06/x
  3. Step 3: Cross multiply
    221.44x = 308.06 × 308.06
  4. Step 4: Simplify right side
    221.44x = 94,902.50
  5. Step 5: Solve for x
    x = 94,902.50/221.44
  6. Step 6: Final answer
    x = 428.57

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.