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Finding the Fourth Proportional to 206.26, 309.43 and 69.29

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Solution

The fourth proportional to 206.26, 309.43 and 69.29 is: 103.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.26 : 309.43 = 69.29 : x
  2. Step 2: Convert to fraction form
    206.26/309.43 = 69.29/x
  3. Step 3: Cross multiply
    206.26x = 309.43 × 69.29
  4. Step 4: Simplify right side
    206.26x = 21,440.40
  5. Step 5: Solve for x
    x = 21,440.40/206.26
  6. Step 6: Final answer
    x = 103.95

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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.