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Finding the Fourth Proportional to 209.41, 288.99 and 120.89

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Solution

The fourth proportional to 209.41, 288.99 and 120.89 is: 166.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.41 : 288.99 = 120.89 : x
  2. Step 2: Convert to fraction form
    209.41/288.99 = 120.89/x
  3. Step 3: Cross multiply
    209.41x = 288.99 × 120.89
  4. Step 4: Simplify right side
    209.41x = 34,936.72
  5. Step 5: Solve for x
    x = 34,936.72/209.41
  6. Step 6: Final answer
    x = 166.84

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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.