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Finding the Third Proportional to 280.97 and 398.67

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Solution

The third proportional to 280.97 and 398.67 is: 565.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.97 : 398.67 = 398.67 : x
  2. Step 2: Convert to fraction form
    280.97/398.67 = 398.67/x
  3. Step 3: Cross multiply
    280.97x = 398.67 × 398.67
  4. Step 4: Simplify right side
    280.97x = 158,939.26
  5. Step 5: Solve for x
    x = 158,939.26/280.97
  6. Step 6: Final answer
    x = 565.68

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.