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Finding the Third Proportional to 129.80 and 282.38

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Solution

The third proportional to 129.80 and 282.38 is: 614.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.80 : 282.38 = 282.38 : x
  2. Step 2: Convert to fraction form
    129.80/282.38 = 282.38/x
  3. Step 3: Cross multiply
    129.80x = 282.38 × 282.38
  4. Step 4: Simplify right side
    129.80x = 79,735.64
  5. Step 5: Solve for x
    x = 79,735.64/129.80
  6. Step 6: Final answer
    x = 614.31

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.