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Finding the Third Proportional to 66.75 and 145.75

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Solution

The third proportional to 66.75 and 145.75 is: 318.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.75 : 145.75 = 145.75 : x
  2. Step 2: Convert to fraction form
    66.75/145.75 = 145.75/x
  3. Step 3: Cross multiply
    66.75x = 145.75 × 145.75
  4. Step 4: Simplify right side
    66.75x = 21,243.06
  5. Step 5: Solve for x
    x = 21,243.06/66.75
  6. Step 6: Final answer
    x = 318.25

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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.