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Finding the Fourth Proportional to 129.62, 179.11 and 98.48

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Solution

The fourth proportional to 129.62, 179.11 and 98.48 is: 136.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.62 : 179.11 = 98.48 : x
  2. Step 2: Convert to fraction form
    129.62/179.11 = 98.48/x
  3. Step 3: Cross multiply
    129.62x = 179.11 × 98.48
  4. Step 4: Simplify right side
    129.62x = 17,639.32
  5. Step 5: Solve for x
    x = 17,639.32/129.62
  6. Step 6: Final answer
    x = 136.09

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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.