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Finding the Third Proportional to 66.75 and 143.25

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Solution

The third proportional to 66.75 and 143.25 is: 307.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.75 : 143.25 = 143.25 : x
  2. Step 2: Convert to fraction form
    66.75/143.25 = 143.25/x
  3. Step 3: Cross multiply
    66.75x = 143.25 × 143.25
  4. Step 4: Simplify right side
    66.75x = 20,520.56
  5. Step 5: Solve for x
    x = 20,520.56/66.75
  6. Step 6: Final answer
    x = 307.42

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.