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Finding the Third Proportional to 66.19 and 139.69

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Solution

The third proportional to 66.19 and 139.69 is: 294.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.19 : 139.69 = 139.69 : x
  2. Step 2: Convert to fraction form
    66.19/139.69 = 139.69/x
  3. Step 3: Cross multiply
    66.19x = 139.69 × 139.69
  4. Step 4: Simplify right side
    66.19x = 19,512.60
  5. Step 5: Solve for x
    x = 19,512.60/66.19
  6. Step 6: Final answer
    x = 294.81

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.