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Finding the Third Proportional to 279.98 and 331.17

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Solution

The third proportional to 279.98 and 331.17 is: 391.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.98 : 331.17 = 331.17 : x
  2. Step 2: Convert to fraction form
    279.98/331.17 = 331.17/x
  3. Step 3: Cross multiply
    279.98x = 331.17 × 331.17
  4. Step 4: Simplify right side
    279.98x = 109,674.81
  5. Step 5: Solve for x
    x = 109,674.81/279.98
  6. Step 6: Final answer
    x = 391.72

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.