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Finding the Fourth Proportional to 129.42, 178.49 and 82.76

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Solution

The fourth proportional to 129.42, 178.49 and 82.76 is: 114.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.42 : 178.49 = 82.76 : x
  2. Step 2: Convert to fraction form
    129.42/178.49 = 82.76/x
  3. Step 3: Cross multiply
    129.42x = 178.49 × 82.76
  4. Step 4: Simplify right side
    129.42x = 14,770.53
  5. Step 5: Solve for x
    x = 14,770.53/129.42
  6. Step 6: Final answer
    x = 114.13

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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.