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Finding the Third Proportional to 276.38 and 686.44

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Solution

The third proportional to 276.38 and 686.44 is: 1,704.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.38 : 686.44 = 686.44 : x
  2. Step 2: Convert to fraction form
    276.38/686.44 = 686.44/x
  3. Step 3: Cross multiply
    276.38x = 686.44 × 686.44
  4. Step 4: Simplify right side
    276.38x = 471,196.44
  5. Step 5: Solve for x
    x = 471,196.44/276.38
  6. Step 6: Final answer
    x = 1,704.92

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Why These Related Problems?

These problems maintain the same ratio (2.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.