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Finding the Third Proportional to 90.75 and 136.38

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Solution

The third proportional to 90.75 and 136.38 is: 204.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.75 : 136.38 = 136.38 : x
  2. Step 2: Convert to fraction form
    90.75/136.38 = 136.38/x
  3. Step 3: Cross multiply
    90.75x = 136.38 × 136.38
  4. Step 4: Simplify right side
    90.75x = 18,598.14
  5. Step 5: Solve for x
    x = 18,598.14/90.75
  6. Step 6: Final answer
    x = 204.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.