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Finding the Third Proportional to 639.50 and 966

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Solution

The third proportional to 639.50 and 966 is: 1,459.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.50 : 966 = 966 : x
  2. Step 2: Convert to fraction form
    639.50/966 = 966/x
  3. Step 3: Cross multiply
    639.50x = 966 × 966
  4. Step 4: Simplify right side
    639.50x = 933,156
  5. Step 5: Solve for x
    x = 933,156/639.50
  6. Step 6: Final answer
    x = 1,459.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.