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Finding the Third Proportional to 66.89 and 143.75

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Solution

The third proportional to 66.89 and 143.75 is: 308.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.89 : 143.75 = 143.75 : x
  2. Step 2: Convert to fraction form
    66.89/143.75 = 143.75/x
  3. Step 3: Cross multiply
    66.89x = 143.75 × 143.75
  4. Step 4: Simplify right side
    66.89x = 20,664.06
  5. Step 5: Solve for x
    x = 20,664.06/66.89
  6. Step 6: Final answer
    x = 308.92

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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.