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Finding the Third Proportional to 639.56 and 729.84

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Solution

The third proportional to 639.56 and 729.84 is: 832.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.56 : 729.84 = 729.84 : x
  2. Step 2: Convert to fraction form
    639.56/729.84 = 729.84/x
  3. Step 3: Cross multiply
    639.56x = 729.84 × 729.84
  4. Step 4: Simplify right side
    639.56x = 532,671.90
  5. Step 5: Solve for x
    x = 532,671.90/639.56
  6. Step 6: Final answer
    x = 832.87

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These problems maintain the same ratio (1.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.