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Finding the Fourth Proportional to 209.39, 288.99 and 126.54

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Solution

The fourth proportional to 209.39, 288.99 and 126.54 is: 174.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.39 : 288.99 = 126.54 : x
  2. Step 2: Convert to fraction form
    209.39/288.99 = 126.54/x
  3. Step 3: Cross multiply
    209.39x = 288.99 × 126.54
  4. Step 4: Simplify right side
    209.39x = 36,568.79
  5. Step 5: Solve for x
    x = 36,568.79/209.39
  6. Step 6: Final answer
    x = 174.65

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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.