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Finding the Fourth Proportional to 209.38, 288.93 and 122.08

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Solution

The fourth proportional to 209.38, 288.93 and 122.08 is: 168.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.38 : 288.93 = 122.08 : x
  2. Step 2: Convert to fraction form
    209.38/288.93 = 122.08/x
  3. Step 3: Cross multiply
    209.38x = 288.93 × 122.08
  4. Step 4: Simplify right side
    209.38x = 35,272.57
  5. Step 5: Solve for x
    x = 35,272.57/209.38
  6. Step 6: Final answer
    x = 168.46

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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.