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Finding the Third Proportional to 115.50 and 280.13

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Solution

The third proportional to 115.50 and 280.13 is: 679.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.50 : 280.13 = 280.13 : x
  2. Step 2: Convert to fraction form
    115.50/280.13 = 280.13/x
  3. Step 3: Cross multiply
    115.50x = 280.13 × 280.13
  4. Step 4: Simplify right side
    115.50x = 78,470.02
  5. Step 5: Solve for x
    x = 78,470.02/115.50
  6. Step 6: Final answer
    x = 679.39

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Why These Related Problems?

These problems maintain the same ratio (2.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.