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Finding the Third Proportional to 129.50 and 265.75

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Solution

The third proportional to 129.50 and 265.75 is: 545.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.50 : 265.75 = 265.75 : x
  2. Step 2: Convert to fraction form
    129.50/265.75 = 265.75/x
  3. Step 3: Cross multiply
    129.50x = 265.75 × 265.75
  4. Step 4: Simplify right side
    129.50x = 70,623.06
  5. Step 5: Solve for x
    x = 70,623.06/129.50
  6. Step 6: Final answer
    x = 545.35

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.