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Finding the Fourth Proportional to 298.14, 411.57 and 198.72

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Solution

The fourth proportional to 298.14, 411.57 and 198.72 is: 274.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.14 : 411.57 = 198.72 : x
  2. Step 2: Convert to fraction form
    298.14/411.57 = 198.72/x
  3. Step 3: Cross multiply
    298.14x = 411.57 × 198.72
  4. Step 4: Simplify right side
    298.14x = 81,787.94
  5. Step 5: Solve for x
    x = 81,787.94/298.14
  6. Step 6: Final answer
    x = 274.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.