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Finding the Fourth Proportional to 209.26, 288.79 and 131.66

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Solution

The fourth proportional to 209.26, 288.79 and 131.66 is: 181.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.26 : 288.79 = 131.66 : x
  2. Step 2: Convert to fraction form
    209.26/288.79 = 131.66/x
  3. Step 3: Cross multiply
    209.26x = 288.79 × 131.66
  4. Step 4: Simplify right side
    209.26x = 38,022.09
  5. Step 5: Solve for x
    x = 38,022.09/209.26
  6. Step 6: Final answer
    x = 181.70

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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.