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Finding the Third Proportional to 124.31 and 135.38

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Solution

The third proportional to 124.31 and 135.38 is: 147.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.31 : 135.38 = 135.38 : x
  2. Step 2: Convert to fraction form
    124.31/135.38 = 135.38/x
  3. Step 3: Cross multiply
    124.31x = 135.38 × 135.38
  4. Step 4: Simplify right side
    124.31x = 18,326.39
  5. Step 5: Solve for x
    x = 18,326.39/124.31
  6. Step 6: Final answer
    x = 147.42

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.