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Finding the Third Proportional to 397.88 and 765.75

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Solution

The third proportional to 397.88 and 765.75 is: 1,473.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.88 : 765.75 = 765.75 : x
  2. Step 2: Convert to fraction form
    397.88/765.75 = 765.75/x
  3. Step 3: Cross multiply
    397.88x = 765.75 × 765.75
  4. Step 4: Simplify right side
    397.88x = 586,373.06
  5. Step 5: Solve for x
    x = 586,373.06/397.88
  6. Step 6: Final answer
    x = 1,473.76

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Why These Related Problems?

These problems maintain the same ratio (1.92) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.