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Finding the Third Proportional to 129 and 285.38

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Solution

The third proportional to 129 and 285.38 is: 631.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    129 : 285.38 = 285.38 : x
  2. Step 2: Convert to fraction form
    129/285.38 = 285.38/x
  3. Step 3: Cross multiply
    129x = 285.38 × 285.38
  4. Step 4: Simplify right side
    129x = 81,438.89
  5. Step 5: Solve for x
    x = 81,438.89/129
  6. Step 6: Final answer
    x = 631.31

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.