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Finding the Third Proportional to 122.55 and 216.42

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Solution

The third proportional to 122.55 and 216.42 is: 382.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.55 : 216.42 = 216.42 : x
  2. Step 2: Convert to fraction form
    122.55/216.42 = 216.42/x
  3. Step 3: Cross multiply
    122.55x = 216.42 × 216.42
  4. Step 4: Simplify right side
    122.55x = 46,838.43
  5. Step 5: Solve for x
    x = 46,838.43/122.55
  6. Step 6: Final answer
    x = 382.18

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Why These Related Problems?

These problems maintain the same ratio (1.77) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.