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Finding the Third Proportional to 31.94 and 68.19

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Solution

The third proportional to 31.94 and 68.19 is: 145.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.94 : 68.19 = 68.19 : x
  2. Step 2: Convert to fraction form
    31.94/68.19 = 68.19/x
  3. Step 3: Cross multiply
    31.94x = 68.19 × 68.19
  4. Step 4: Simplify right side
    31.94x = 4,649.54
  5. Step 5: Solve for x
    x = 4,649.54/31.94
  6. Step 6: Final answer
    x = 145.58

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.