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Finding the Third Proportional to 381.11 and 459.42

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Solution

The third proportional to 381.11 and 459.42 is: 553.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.11 : 459.42 = 459.42 : x
  2. Step 2: Convert to fraction form
    381.11/459.42 = 459.42/x
  3. Step 3: Cross multiply
    381.11x = 459.42 × 459.42
  4. Step 4: Simplify right side
    381.11x = 211,068.46
  5. Step 5: Solve for x
    x = 211,068.46/381.11
  6. Step 6: Final answer
    x = 553.82

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.