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Finding the Third Proportional to 129.28 and 201.09

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Solution

The third proportional to 129.28 and 201.09 is: 312.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.28 : 201.09 = 201.09 : x
  2. Step 2: Convert to fraction form
    129.28/201.09 = 201.09/x
  3. Step 3: Cross multiply
    129.28x = 201.09 × 201.09
  4. Step 4: Simplify right side
    129.28x = 40,438.70
  5. Step 5: Solve for x
    x = 40,438.70/129.28
  6. Step 6: Final answer
    x = 312.80

Related Problems

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.