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Finding the Fourth Proportional to 206.69, 309.96 and 76.66

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Solution

The fourth proportional to 206.69, 309.96 and 76.66 is: 114.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.69 : 309.96 = 76.66 : x
  2. Step 2: Convert to fraction form
    206.69/309.96 = 76.66/x
  3. Step 3: Cross multiply
    206.69x = 309.96 × 76.66
  4. Step 4: Simplify right side
    206.69x = 23,761.53
  5. Step 5: Solve for x
    x = 23,761.53/206.69
  6. Step 6: Final answer
    x = 114.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.