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Finding the Fourth Proportional to 215.16, 321.20 and 198

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Solution

The fourth proportional to 215.16, 321.20 and 198 is: 295.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.16 : 321.20 = 198 : x
  2. Step 2: Convert to fraction form
    215.16/321.20 = 198/x
  3. Step 3: Cross multiply
    215.16x = 321.20 × 198
  4. Step 4: Simplify right side
    215.16x = 63,597.60
  5. Step 5: Solve for x
    x = 63,597.60/215.16
  6. Step 6: Final answer
    x = 295.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.