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Finding the Third Proportional to 85.38 and 135.63

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Solution

The third proportional to 85.38 and 135.63 is: 215.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.38 : 135.63 = 135.63 : x
  2. Step 2: Convert to fraction form
    85.38/135.63 = 135.63/x
  3. Step 3: Cross multiply
    85.38x = 135.63 × 135.63
  4. Step 4: Simplify right side
    85.38x = 18,394.14
  5. Step 5: Solve for x
    x = 18,394.14/85.38
  6. Step 6: Final answer
    x = 215.45

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.