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Finding the Fourth Proportional to 215.64, 321.87 and 198.54

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Solution

The fourth proportional to 215.64, 321.87 and 198.54 is: 296.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.64 : 321.87 = 198.54 : x
  2. Step 2: Convert to fraction form
    215.64/321.87 = 198.54/x
  3. Step 3: Cross multiply
    215.64x = 321.87 × 198.54
  4. Step 4: Simplify right side
    215.64x = 63,904.07
  5. Step 5: Solve for x
    x = 63,904.07/215.64
  6. Step 6: Final answer
    x = 296.35

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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.