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Finding the Third Proportional to 122.38 and 256.94

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Solution

The third proportional to 122.38 and 256.94 is: 539.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.38 : 256.94 = 256.94 : x
  2. Step 2: Convert to fraction form
    122.38/256.94 = 256.94/x
  3. Step 3: Cross multiply
    122.38x = 256.94 × 256.94
  4. Step 4: Simplify right side
    122.38x = 66,016.88
  5. Step 5: Solve for x
    x = 66,016.88/122.38
  6. Step 6: Final answer
    x = 539.46

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.