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Finding the Fourth Proportional to 199.11, 298.80 and 77.38

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Solution

The fourth proportional to 199.11, 298.80 and 77.38 is: 116.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.11 : 298.80 = 77.38 : x
  2. Step 2: Convert to fraction form
    199.11/298.80 = 77.38/x
  3. Step 3: Cross multiply
    199.11x = 298.80 × 77.38
  4. Step 4: Simplify right side
    199.11x = 23,120.86
  5. Step 5: Solve for x
    x = 23,120.86/199.11
  6. Step 6: Final answer
    x = 116.12

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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.