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Finding the Third Proportional to 382.31 and 787.31

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Solution

The third proportional to 382.31 and 787.31 is: 1,621.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.31 : 787.31 = 787.31 : x
  2. Step 2: Convert to fraction form
    382.31/787.31 = 787.31/x
  3. Step 3: Cross multiply
    382.31x = 787.31 × 787.31
  4. Step 4: Simplify right side
    382.31x = 619,860.97
  5. Step 5: Solve for x
    x = 619,860.97/382.31
  6. Step 6: Final answer
    x = 1,621.35

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.