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Finding the Fourth Proportional to 209.04, 288.36 and 121.65

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Solution

The fourth proportional to 209.04, 288.36 and 121.65 is: 167.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.04 : 288.36 = 121.65 : x
  2. Step 2: Convert to fraction form
    209.04/288.36 = 121.65/x
  3. Step 3: Cross multiply
    209.04x = 288.36 × 121.65
  4. Step 4: Simplify right side
    209.04x = 35,078.99
  5. Step 5: Solve for x
    x = 35,078.99/209.04
  6. Step 6: Final answer
    x = 167.81

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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.