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Finding the Third Proportional to 138.11 and 256.29

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Solution

The third proportional to 138.11 and 256.29 is: 475.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.11 : 256.29 = 256.29 : x
  2. Step 2: Convert to fraction form
    138.11/256.29 = 256.29/x
  3. Step 3: Cross multiply
    138.11x = 256.29 × 256.29
  4. Step 4: Simplify right side
    138.11x = 65,684.08
  5. Step 5: Solve for x
    x = 65,684.08/138.11
  6. Step 6: Final answer
    x = 475.59

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.