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Finding the Fourth Proportional to 215.64, 322.98 and 198.78

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Solution

The fourth proportional to 215.64, 322.98 and 198.78 is: 297.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.64 : 322.98 = 198.78 : x
  2. Step 2: Convert to fraction form
    215.64/322.98 = 198.78/x
  3. Step 3: Cross multiply
    215.64x = 322.98 × 198.78
  4. Step 4: Simplify right side
    215.64x = 64,201.96
  5. Step 5: Solve for x
    x = 64,201.96/215.64
  6. Step 6: Final answer
    x = 297.73

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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.