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Finding the Fourth Proportional to 129.10, 177.97 and 102.64

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Solution

The fourth proportional to 129.10, 177.97 and 102.64 is: 141.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.10 : 177.97 = 102.64 : x
  2. Step 2: Convert to fraction form
    129.10/177.97 = 102.64/x
  3. Step 3: Cross multiply
    129.10x = 177.97 × 102.64
  4. Step 4: Simplify right side
    129.10x = 18,265.69
  5. Step 5: Solve for x
    x = 18,265.69/129.10
  6. Step 6: Final answer
    x = 141.49

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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.