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Finding the Third Proportional to 312.38 and 615.75

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Solution

The third proportional to 312.38 and 615.75 is: 1,213.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.38 : 615.75 = 615.75 : x
  2. Step 2: Convert to fraction form
    312.38/615.75 = 615.75/x
  3. Step 3: Cross multiply
    312.38x = 615.75 × 615.75
  4. Step 4: Simplify right side
    312.38x = 379,148.06
  5. Step 5: Solve for x
    x = 379,148.06/312.38
  6. Step 6: Final answer
    x = 1,213.76

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.