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Finding the Fourth Proportional to 122.72, 183.92 and 79.38

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Solution

The fourth proportional to 122.72, 183.92 and 79.38 is: 118.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.72 : 183.92 = 79.38 : x
  2. Step 2: Convert to fraction form
    122.72/183.92 = 79.38/x
  3. Step 3: Cross multiply
    122.72x = 183.92 × 79.38
  4. Step 4: Simplify right side
    122.72x = 14,599.17
  5. Step 5: Solve for x
    x = 14,599.17/122.72
  6. Step 6: Final answer
    x = 118.97

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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.