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Finding the Third Proportional to 486.06 and 639.19

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Solution

The third proportional to 486.06 and 639.19 is: 840.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.06 : 639.19 = 639.19 : x
  2. Step 2: Convert to fraction form
    486.06/639.19 = 639.19/x
  3. Step 3: Cross multiply
    486.06x = 639.19 × 639.19
  4. Step 4: Simplify right side
    486.06x = 408,560.66
  5. Step 5: Solve for x
    x = 408,560.66/486.06
  6. Step 6: Final answer
    x = 840.55

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.