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Finding the Fourth Proportional to 205.21, 308.09 and 198.19

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Solution

The fourth proportional to 205.21, 308.09 and 198.19 is: 297.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.21 : 308.09 = 198.19 : x
  2. Step 2: Convert to fraction form
    205.21/308.09 = 198.19/x
  3. Step 3: Cross multiply
    205.21x = 308.09 × 198.19
  4. Step 4: Simplify right side
    205.21x = 61,060.36
  5. Step 5: Solve for x
    x = 61,060.36/205.21
  6. Step 6: Final answer
    x = 297.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.