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Finding the Fourth Proportional to 79.59, 118.75 and 69.85

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Solution

The fourth proportional to 79.59, 118.75 and 69.85 is: 104.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.59 : 118.75 = 69.85 : x
  2. Step 2: Convert to fraction form
    79.59/118.75 = 69.85/x
  3. Step 3: Cross multiply
    79.59x = 118.75 × 69.85
  4. Step 4: Simplify right side
    79.59x = 8,294.73
  5. Step 5: Solve for x
    x = 8,294.73/79.59
  6. Step 6: Final answer
    x = 104.22

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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.