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Finding the Third Proportional to 65.11 and 128.67

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Solution

The third proportional to 65.11 and 128.67 is: 254.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.11 : 128.67 = 128.67 : x
  2. Step 2: Convert to fraction form
    65.11/128.67 = 128.67/x
  3. Step 3: Cross multiply
    65.11x = 128.67 × 128.67
  4. Step 4: Simplify right side
    65.11x = 16,556.45
  5. Step 5: Solve for x
    x = 16,556.45/65.11
  6. Step 6: Final answer
    x = 254.29

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Why These Related Problems?

These problems maintain the same ratio (1.98) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.