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Finding the Fourth Proportional to 198.96, 298.43 and 77.30

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Solution

The fourth proportional to 198.96, 298.43 and 77.30 is: 115.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.96 : 298.43 = 77.30 : x
  2. Step 2: Convert to fraction form
    198.96/298.43 = 77.30/x
  3. Step 3: Cross multiply
    198.96x = 298.43 × 77.30
  4. Step 4: Simplify right side
    198.96x = 23,070.28
  5. Step 5: Solve for x
    x = 23,070.28/198.96
  6. Step 6: Final answer
    x = 115.96

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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.