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Finding the Third Proportional to 395.51 and 816.96

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Solution

The third proportional to 395.51 and 816.96 is: 1,687.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.51 : 816.96 = 816.96 : x
  2. Step 2: Convert to fraction form
    395.51/816.96 = 816.96/x
  3. Step 3: Cross multiply
    395.51x = 816.96 × 816.96
  4. Step 4: Simplify right side
    395.51x = 667,425.17
  5. Step 5: Solve for x
    x = 667,425.17/395.51
  6. Step 6: Final answer
    x = 1,687.51

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.