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Finding the Third Proportional to 251.38 and 312.13

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Solution

The third proportional to 251.38 and 312.13 is: 387.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.38 : 312.13 = 312.13 : x
  2. Step 2: Convert to fraction form
    251.38/312.13 = 312.13/x
  3. Step 3: Cross multiply
    251.38x = 312.13 × 312.13
  4. Step 4: Simplify right side
    251.38x = 97,422.02
  5. Step 5: Solve for x
    x = 97,422.02/251.38
  6. Step 6: Final answer
    x = 387.56

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Why These Related Problems?

These problems maintain the same ratio (1.24) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.