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Finding the Fourth Proportional to 129.67, 178.76 and 94.19

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Solution

The fourth proportional to 129.67, 178.76 and 94.19 is: 129.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.67 : 178.76 = 94.19 : x
  2. Step 2: Convert to fraction form
    129.67/178.76 = 94.19/x
  3. Step 3: Cross multiply
    129.67x = 178.76 × 94.19
  4. Step 4: Simplify right side
    129.67x = 16,836.75
  5. Step 5: Solve for x
    x = 16,836.75/129.67
  6. Step 6: Final answer
    x = 129.85

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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.