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Finding the Fourth Proportional to 209.03, 288.41 and 121.70

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Solution

The fourth proportional to 209.03, 288.41 and 121.70 is: 167.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.03 : 288.41 = 121.70 : x
  2. Step 2: Convert to fraction form
    209.03/288.41 = 121.70/x
  3. Step 3: Cross multiply
    209.03x = 288.41 × 121.70
  4. Step 4: Simplify right side
    209.03x = 35,099.61
  5. Step 5: Solve for x
    x = 35,099.61/209.03
  6. Step 6: Final answer
    x = 167.92

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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.