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Finding the Third Proportional to 129.94 and 148.78

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Solution

The third proportional to 129.94 and 148.78 is: 170.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.94 : 148.78 = 148.78 : x
  2. Step 2: Convert to fraction form
    129.94/148.78 = 148.78/x
  3. Step 3: Cross multiply
    129.94x = 148.78 × 148.78
  4. Step 4: Simplify right side
    129.94x = 22,135.86
  5. Step 5: Solve for x
    x = 22,135.86/129.94
  6. Step 6: Final answer
    x = 170.36

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.