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Finding the Fourth Proportional to 151.65, 209.39 and 122.09

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Solution

The fourth proportional to 151.65, 209.39 and 122.09 is: 168.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.65 : 209.39 = 122.09 : x
  2. Step 2: Convert to fraction form
    151.65/209.39 = 122.09/x
  3. Step 3: Cross multiply
    151.65x = 209.39 × 122.09
  4. Step 4: Simplify right side
    151.65x = 25,562.77
  5. Step 5: Solve for x
    x = 25,562.77/151.65
  6. Step 6: Final answer
    x = 168.56

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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.