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Finding the Third Proportional to 109.69 and 129.94

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Solution

The third proportional to 109.69 and 129.94 is: 153.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.69 : 129.94 = 129.94 : x
  2. Step 2: Convert to fraction form
    109.69/129.94 = 129.94/x
  3. Step 3: Cross multiply
    109.69x = 129.94 × 129.94
  4. Step 4: Simplify right side
    109.69x = 16,883.75
  5. Step 5: Solve for x
    x = 16,883.75/109.69
  6. Step 6: Final answer
    x = 153.93

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.