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Finding the Third Proportional to 415.75 and 643.88

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Solution

The third proportional to 415.75 and 643.88 is: 997.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.75 : 643.88 = 643.88 : x
  2. Step 2: Convert to fraction form
    415.75/643.88 = 643.88/x
  3. Step 3: Cross multiply
    415.75x = 643.88 × 643.88
  4. Step 4: Simplify right side
    415.75x = 414,575.02
  5. Step 5: Solve for x
    x = 414,575.02/415.75
  6. Step 6: Final answer
    x = 997.17

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.