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Finding the Third Proportional to 138.38 and 218.94

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Solution

The third proportional to 138.38 and 218.94 is: 346.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.38 : 218.94 = 218.94 : x
  2. Step 2: Convert to fraction form
    138.38/218.94 = 218.94/x
  3. Step 3: Cross multiply
    138.38x = 218.94 × 218.94
  4. Step 4: Simplify right side
    138.38x = 47,933.63
  5. Step 5: Solve for x
    x = 47,933.63/138.38
  6. Step 6: Final answer
    x = 346.40

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.