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Finding the Fourth Proportional to 206.69, 309.92 and 84.92

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Solution

The fourth proportional to 206.69, 309.92 and 84.92 is: 127.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.69 : 309.92 = 84.92 : x
  2. Step 2: Convert to fraction form
    206.69/309.92 = 84.92/x
  3. Step 3: Cross multiply
    206.69x = 309.92 × 84.92
  4. Step 4: Simplify right side
    206.69x = 26,318.41
  5. Step 5: Solve for x
    x = 26,318.41/206.69
  6. Step 6: Final answer
    x = 127.33

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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.