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Finding the Fourth Proportional to 79.27, 118.20 and 69.68

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Solution

The fourth proportional to 79.27, 118.20 and 69.68 is: 103.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.27 : 118.20 = 69.68 : x
  2. Step 2: Convert to fraction form
    79.27/118.20 = 69.68/x
  3. Step 3: Cross multiply
    79.27x = 118.20 × 69.68
  4. Step 4: Simplify right side
    79.27x = 8,236.18
  5. Step 5: Solve for x
    x = 8,236.18/79.27
  6. Step 6: Final answer
    x = 103.90

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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.