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Finding the Third Proportional to 135.38 and 256.69

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Solution

The third proportional to 135.38 and 256.69 is: 486.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.38 : 256.69 = 256.69 : x
  2. Step 2: Convert to fraction form
    135.38/256.69 = 256.69/x
  3. Step 3: Cross multiply
    135.38x = 256.69 × 256.69
  4. Step 4: Simplify right side
    135.38x = 65,888.47
  5. Step 5: Solve for x
    x = 65,888.47/135.38
  6. Step 6: Final answer
    x = 486.71

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Why These Related Problems?

These problems maintain the same ratio (1.90) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.