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Finding the Third Proportional to 639.56 and 1,377

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Solution

The third proportional to 639.56 and 1,377 is: 2,964.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.56 : 1,377 = 1,377 : x
  2. Step 2: Convert to fraction form
    639.56/1,377 = 1,377/x
  3. Step 3: Cross multiply
    639.56x = 1,377 × 1,377
  4. Step 4: Simplify right side
    639.56x = 1,896,129
  5. Step 5: Solve for x
    x = 1,896,129/639.56
  6. Step 6: Final answer
    x = 2,964.73

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.