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Finding the Third Proportional to 139.97 and 305.72

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Solution

The third proportional to 139.97 and 305.72 is: 667.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.97 : 305.72 = 305.72 : x
  2. Step 2: Convert to fraction form
    139.97/305.72 = 305.72/x
  3. Step 3: Cross multiply
    139.97x = 305.72 × 305.72
  4. Step 4: Simplify right side
    139.97x = 93,463.95
  5. Step 5: Solve for x
    x = 93,463.95/139.97
  6. Step 6: Final answer
    x = 667.75

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.