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Finding the Fourth Proportional to 76.30, 104.68 and 75.67

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Solution

The fourth proportional to 76.30, 104.68 and 75.67 is: 103.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.30 : 104.68 = 75.67 : x
  2. Step 2: Convert to fraction form
    76.30/104.68 = 75.67/x
  3. Step 3: Cross multiply
    76.30x = 104.68 × 75.67
  4. Step 4: Simplify right side
    76.30x = 7,920.54
  5. Step 5: Solve for x
    x = 7,920.54/76.30
  6. Step 6: Final answer
    x = 103.81

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.