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Finding the Fourth Proportional to 198.74, 298.05 and 61.80

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Solution

The fourth proportional to 198.74, 298.05 and 61.80 is: 92.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.74 : 298.05 = 61.80 : x
  2. Step 2: Convert to fraction form
    198.74/298.05 = 61.80/x
  3. Step 3: Cross multiply
    198.74x = 298.05 × 61.80
  4. Step 4: Simplify right side
    198.74x = 18,419.49
  5. Step 5: Solve for x
    x = 18,419.49/198.74
  6. Step 6: Final answer
    x = 92.68

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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.