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Finding the Third Proportional to 215 and 418.75

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Solution

The third proportional to 215 and 418.75 is: 815.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    215 : 418.75 = 418.75 : x
  2. Step 2: Convert to fraction form
    215/418.75 = 418.75/x
  3. Step 3: Cross multiply
    215x = 418.75 × 418.75
  4. Step 4: Simplify right side
    215x = 175,351.56
  5. Step 5: Solve for x
    x = 175,351.56/215
  6. Step 6: Final answer
    x = 815.59

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Why These Related Problems?

These problems maintain the same ratio (1.95) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.