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Finding the Fourth Proportional to 129.75, 194.61 and 52.71

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Solution

The fourth proportional to 129.75, 194.61 and 52.71 is: 79.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.75 : 194.61 = 52.71 : x
  2. Step 2: Convert to fraction form
    129.75/194.61 = 52.71/x
  3. Step 3: Cross multiply
    129.75x = 194.61 × 52.71
  4. Step 4: Simplify right side
    129.75x = 10,257.89
  5. Step 5: Solve for x
    x = 10,257.89/129.75
  6. Step 6: Final answer
    x = 79.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.