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Finding the Third Proportional to 129.38 and 145.50

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Solution

The third proportional to 129.38 and 145.50 is: 163.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.38 : 145.50 = 145.50 : x
  2. Step 2: Convert to fraction form
    129.38/145.50 = 145.50/x
  3. Step 3: Cross multiply
    129.38x = 145.50 × 145.50
  4. Step 4: Simplify right side
    129.38x = 21,170.25
  5. Step 5: Solve for x
    x = 21,170.25/129.38
  6. Step 6: Final answer
    x = 163.63

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Why These Related Problems?

These problems maintain the same ratio (1.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.