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Finding the Third Proportional to 81.53 and 128.13

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Solution

The third proportional to 81.53 and 128.13 is: 201.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.53 : 128.13 = 128.13 : x
  2. Step 2: Convert to fraction form
    81.53/128.13 = 128.13/x
  3. Step 3: Cross multiply
    81.53x = 128.13 × 128.13
  4. Step 4: Simplify right side
    81.53x = 16,416.02
  5. Step 5: Solve for x
    x = 16,416.02/81.53
  6. Step 6: Final answer
    x = 201.35

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.