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Finding the Third Proportional to 387.38 and 787.88

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Solution

The third proportional to 387.38 and 787.88 is: 1,602.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.38 : 787.88 = 787.88 : x
  2. Step 2: Convert to fraction form
    387.38/787.88 = 787.88/x
  3. Step 3: Cross multiply
    387.38x = 787.88 × 787.88
  4. Step 4: Simplify right side
    387.38x = 620,747.02
  5. Step 5: Solve for x
    x = 620,747.02/387.38
  6. Step 6: Final answer
    x = 1,602.44

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.