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Finding the Fourth Proportional to 206.88, 309.17 and 166.11

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Solution

The fourth proportional to 206.88, 309.17 and 166.11 is: 248.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.88 : 309.17 = 166.11 : x
  2. Step 2: Convert to fraction form
    206.88/309.17 = 166.11/x
  3. Step 3: Cross multiply
    206.88x = 309.17 × 166.11
  4. Step 4: Simplify right side
    206.88x = 51,356.23
  5. Step 5: Solve for x
    x = 51,356.23/206.88
  6. Step 6: Final answer
    x = 248.24

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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.