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Finding the Fourth Proportional to 129.08, 178.08 and 82.44

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Solution

The fourth proportional to 129.08, 178.08 and 82.44 is: 113.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.08 : 178.08 = 82.44 : x
  2. Step 2: Convert to fraction form
    129.08/178.08 = 82.44/x
  3. Step 3: Cross multiply
    129.08x = 178.08 × 82.44
  4. Step 4: Simplify right side
    129.08x = 14,680.92
  5. Step 5: Solve for x
    x = 14,680.92/129.08
  6. Step 6: Final answer
    x = 113.74

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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.