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Finding the Fourth Proportional to 79.69, 120 and 69.67

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Solution

The fourth proportional to 79.69, 120 and 69.67 is: 104.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.69 : 120 = 69.67 : x
  2. Step 2: Convert to fraction form
    79.69/120 = 69.67/x
  3. Step 3: Cross multiply
    79.69x = 120 × 69.67
  4. Step 4: Simplify right side
    79.69x = 8,360.40
  5. Step 5: Solve for x
    x = 8,360.40/79.69
  6. Step 6: Final answer
    x = 104.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.