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Finding the Third Proportional to 117.63 and 217.25

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Solution

The third proportional to 117.63 and 217.25 is: 401.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.63 : 217.25 = 217.25 : x
  2. Step 2: Convert to fraction form
    117.63/217.25 = 217.25/x
  3. Step 3: Cross multiply
    117.63x = 217.25 × 217.25
  4. Step 4: Simplify right side
    117.63x = 47,197.56
  5. Step 5: Solve for x
    x = 47,197.56/117.63
  6. Step 6: Final answer
    x = 401.25

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Why These Related Problems?

These problems maintain the same ratio (1.85) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.