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Finding the Fourth Proportional to 129.05, 177.97 and 102.79

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Solution

The fourth proportional to 129.05, 177.97 and 102.79 is: 141.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.05 : 177.97 = 102.79 : x
  2. Step 2: Convert to fraction form
    129.05/177.97 = 102.79/x
  3. Step 3: Cross multiply
    129.05x = 177.97 × 102.79
  4. Step 4: Simplify right side
    129.05x = 18,292.83
  5. Step 5: Solve for x
    x = 18,292.83/129.05
  6. Step 6: Final answer
    x = 141.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.