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Finding the Third Proportional to 129 and 285.75

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Solution

The third proportional to 129 and 285.75 is: 632.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    129 : 285.75 = 285.75 : x
  2. Step 2: Convert to fraction form
    129/285.75 = 285.75/x
  3. Step 3: Cross multiply
    129x = 285.75 × 285.75
  4. Step 4: Simplify right side
    129x = 81,653.06
  5. Step 5: Solve for x
    x = 81,653.06/129
  6. Step 6: Final answer
    x = 632.97

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.