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Finding the Third Proportional to 215.25 and 312.75

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Solution

The third proportional to 215.25 and 312.75 is: 454.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.25 : 312.75 = 312.75 : x
  2. Step 2: Convert to fraction form
    215.25/312.75 = 312.75/x
  3. Step 3: Cross multiply
    215.25x = 312.75 × 312.75
  4. Step 4: Simplify right side
    215.25x = 97,812.56
  5. Step 5: Solve for x
    x = 97,812.56/215.25
  6. Step 6: Final answer
    x = 454.41

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.