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Finding the Third Proportional to 128.13 and 285.13

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Solution

The third proportional to 128.13 and 285.13 is: 634.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.13 : 285.13 = 285.13 : x
  2. Step 2: Convert to fraction form
    128.13/285.13 = 285.13/x
  3. Step 3: Cross multiply
    128.13x = 285.13 × 285.13
  4. Step 4: Simplify right side
    128.13x = 81,296.27
  5. Step 5: Solve for x
    x = 81,296.27/128.13
  6. Step 6: Final answer
    x = 634.51

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Why These Related Problems?

These problems maintain the same ratio (2.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.