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Finding the Fourth Proportional to 198.76, 298.18 and 90.68

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Solution

The fourth proportional to 198.76, 298.18 and 90.68 is: 136.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.76 : 298.18 = 90.68 : x
  2. Step 2: Convert to fraction form
    198.76/298.18 = 90.68/x
  3. Step 3: Cross multiply
    198.76x = 298.18 × 90.68
  4. Step 4: Simplify right side
    198.76x = 27,038.96
  5. Step 5: Solve for x
    x = 27,038.96/198.76
  6. Step 6: Final answer
    x = 136.04

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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.