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Finding the Fourth Proportional to 198.96, 298.36 and 90.64

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Solution

The fourth proportional to 198.96, 298.36 and 90.64 is: 135.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.96 : 298.36 = 90.64 : x
  2. Step 2: Convert to fraction form
    198.96/298.36 = 90.64/x
  3. Step 3: Cross multiply
    198.96x = 298.36 × 90.64
  4. Step 4: Simplify right side
    198.96x = 27,043.35
  5. Step 5: Solve for x
    x = 27,043.35/198.96
  6. Step 6: Final answer
    x = 135.92

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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.