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Finding the Third Proportional to 122.09 and 257.36

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Solution

The third proportional to 122.09 and 257.36 is: 542.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.09 : 257.36 = 257.36 : x
  2. Step 2: Convert to fraction form
    122.09/257.36 = 257.36/x
  3. Step 3: Cross multiply
    122.09x = 257.36 × 257.36
  4. Step 4: Simplify right side
    122.09x = 66,232.59
  5. Step 5: Solve for x
    x = 66,232.59/122.09
  6. Step 6: Final answer
    x = 542.48

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.