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Finding the Fourth Proportional to 209.39, 289.01 and 122.08

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Solution

The fourth proportional to 209.39, 289.01 and 122.08 is: 168.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.39 : 289.01 = 122.08 : x
  2. Step 2: Convert to fraction form
    209.39/289.01 = 122.08/x
  3. Step 3: Cross multiply
    209.39x = 289.01 × 122.08
  4. Step 4: Simplify right side
    209.39x = 35,281.73
  5. Step 5: Solve for x
    x = 35,281.73/209.39
  6. Step 6: Final answer
    x = 168.50

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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.