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Finding the Third Proportional to 129.88 and 274.13

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Solution

The third proportional to 129.88 and 274.13 is: 578.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.88 : 274.13 = 274.13 : x
  2. Step 2: Convert to fraction form
    129.88/274.13 = 274.13/x
  3. Step 3: Cross multiply
    129.88x = 274.13 × 274.13
  4. Step 4: Simplify right side
    129.88x = 75,144.52
  5. Step 5: Solve for x
    x = 75,144.52/129.88
  6. Step 6: Final answer
    x = 578.59

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.