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Finding the Fourth Proportional to 150, 206.82 and 122.31

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Solution

The fourth proportional to 150, 206.82 and 122.31 is: 168.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    150 : 206.82 = 122.31 : x
  2. Step 2: Convert to fraction form
    150/206.82 = 122.31/x
  3. Step 3: Cross multiply
    150x = 206.82 × 122.31
  4. Step 4: Simplify right side
    150x = 25,296.15
  5. Step 5: Solve for x
    x = 25,296.15/150
  6. Step 6: Final answer
    x = 168.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.