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Finding the Fourth Proportional to 215.97, 297.21 and 198.57

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Solution

The fourth proportional to 215.97, 297.21 and 198.57 is: 273.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.97 : 297.21 = 198.57 : x
  2. Step 2: Convert to fraction form
    215.97/297.21 = 198.57/x
  3. Step 3: Cross multiply
    215.97x = 297.21 × 198.57
  4. Step 4: Simplify right side
    215.97x = 59,016.99
  5. Step 5: Solve for x
    x = 59,016.99/215.97
  6. Step 6: Final answer
    x = 273.26

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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.