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Finding the Third Proportional to 139.22 and 218.95

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Solution

The third proportional to 139.22 and 218.95 is: 344.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.22 : 218.95 = 218.95 : x
  2. Step 2: Convert to fraction form
    139.22/218.95 = 218.95/x
  3. Step 3: Cross multiply
    139.22x = 218.95 × 218.95
  4. Step 4: Simplify right side
    139.22x = 47,940.47
  5. Step 5: Solve for x
    x = 47,940.47/139.22
  6. Step 6: Final answer
    x = 344.35

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.