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Finding the Fourth Proportional to 76.91, 114.78 and 69.62

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Solution

The fourth proportional to 76.91, 114.78 and 69.62 is: 103.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.91 : 114.78 = 69.62 : x
  2. Step 2: Convert to fraction form
    76.91/114.78 = 69.62/x
  3. Step 3: Cross multiply
    76.91x = 114.78 × 69.62
  4. Step 4: Simplify right side
    76.91x = 7,990.41
  5. Step 5: Solve for x
    x = 7,990.41/76.91
  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.