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Finding the Third Proportional to 711 and 815

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Solution

The third proportional to 711 and 815 is: 934.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    711 : 815 = 815 : x
  2. Step 2: Convert to fraction form
    711/815 = 815/x
  3. Step 3: Cross multiply
    711x = 815 × 815
  4. Step 4: Simplify right side
    711x = 664,225
  5. Step 5: Solve for x
    x = 664,225/711
  6. Step 6: Final answer
    x = 934.21

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.