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Finding the Fourth Proportional to 213.82, 294.45 and 209.05

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Solution

The fourth proportional to 213.82, 294.45 and 209.05 is: 287.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.82 : 294.45 = 209.05 : x
  2. Step 2: Convert to fraction form
    213.82/294.45 = 209.05/x
  3. Step 3: Cross multiply
    213.82x = 294.45 × 209.05
  4. Step 4: Simplify right side
    213.82x = 61,554.77
  5. Step 5: Solve for x
    x = 61,554.77/213.82
  6. Step 6: Final answer
    x = 287.88

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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.