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Finding the Third Proportional to 66.88 and 145.19

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Solution

The third proportional to 66.88 and 145.19 is: 315.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.88 : 145.19 = 145.19 : x
  2. Step 2: Convert to fraction form
    66.88/145.19 = 145.19/x
  3. Step 3: Cross multiply
    66.88x = 145.19 × 145.19
  4. Step 4: Simplify right side
    66.88x = 21,079.41
  5. Step 5: Solve for x
    x = 21,079.41/66.88
  6. Step 6: Final answer
    x = 315.21

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.