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Finding the Third Proportional to 138.90 and 216.11

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Solution

The third proportional to 138.90 and 216.11 is: 336.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.90 : 216.11 = 216.11 : x
  2. Step 2: Convert to fraction form
    138.90/216.11 = 216.11/x
  3. Step 3: Cross multiply
    138.90x = 216.11 × 216.11
  4. Step 4: Simplify right side
    138.90x = 46,701.57
  5. Step 5: Solve for x
    x = 46,701.57/138.90
  6. Step 6: Final answer
    x = 336.22

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.