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Finding the Third Proportional to 129.75 and 279.75

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Solution

The third proportional to 129.75 and 279.75 is: 603.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.75 : 279.75 = 279.75 : x
  2. Step 2: Convert to fraction form
    129.75/279.75 = 279.75/x
  3. Step 3: Cross multiply
    129.75x = 279.75 × 279.75
  4. Step 4: Simplify right side
    129.75x = 78,260.06
  5. Step 5: Solve for x
    x = 78,260.06/129.75
  6. Step 6: Final answer
    x = 603.16

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.