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Finding the Third Proportional to 280.13 and 685.55

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Solution

The third proportional to 280.13 and 685.55 is: 1,677.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.13 : 685.55 = 685.55 : x
  2. Step 2: Convert to fraction form
    280.13/685.55 = 685.55/x
  3. Step 3: Cross multiply
    280.13x = 685.55 × 685.55
  4. Step 4: Simplify right side
    280.13x = 469,974.52
  5. Step 5: Solve for x
    x = 469,974.52/280.13
  6. Step 6: Final answer
    x = 1,677.73

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Why These Related Problems?

These problems maintain the same ratio (2.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.