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Finding the Third Proportional to 138.50 and 305

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Solution

The third proportional to 138.50 and 305 is: 671.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.50 : 305 = 305 : x
  2. Step 2: Convert to fraction form
    138.50/305 = 305/x
  3. Step 3: Cross multiply
    138.50x = 305 × 305
  4. Step 4: Simplify right side
    138.50x = 93,025
  5. Step 5: Solve for x
    x = 93,025/138.50
  6. Step 6: Final answer
    x = 671.66

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.