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Finding the Third Proportional to 129 and 147.75

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Solution

The third proportional to 129 and 147.75 is: 169.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    129 : 147.75 = 147.75 : x
  2. Step 2: Convert to fraction form
    129/147.75 = 147.75/x
  3. Step 3: Cross multiply
    129x = 147.75 × 147.75
  4. Step 4: Simplify right side
    129x = 21,830.06
  5. Step 5: Solve for x
    x = 21,830.06/129
  6. Step 6: Final answer
    x = 169.23

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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.