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Finding the Fourth Proportional to 79.36, 118.19 and 75.85

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Solution

The fourth proportional to 79.36, 118.19 and 75.85 is: 112.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.36 : 118.19 = 75.85 : x
  2. Step 2: Convert to fraction form
    79.36/118.19 = 75.85/x
  3. Step 3: Cross multiply
    79.36x = 118.19 × 75.85
  4. Step 4: Simplify right side
    79.36x = 8,964.61
  5. Step 5: Solve for x
    x = 8,964.61/79.36
  6. Step 6: Final answer
    x = 112.96

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.