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Finding the Fourth Proportional to 129.73, 179.01 and 74.47

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Solution

The fourth proportional to 129.73, 179.01 and 74.47 is: 102.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.73 : 179.01 = 74.47 : x
  2. Step 2: Convert to fraction form
    129.73/179.01 = 74.47/x
  3. Step 3: Cross multiply
    129.73x = 179.01 × 74.47
  4. Step 4: Simplify right side
    129.73x = 13,329.98
  5. Step 5: Solve for x
    x = 13,329.98/129.73
  6. Step 6: Final answer
    x = 102.76

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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.