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Finding the Fourth Proportional to 298.35, 411.90 and 198.93

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Solution

The fourth proportional to 298.35, 411.90 and 198.93 is: 274.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.35 : 411.90 = 198.93 : x
  2. Step 2: Convert to fraction form
    298.35/411.90 = 198.93/x
  3. Step 3: Cross multiply
    298.35x = 411.90 × 198.93
  4. Step 4: Simplify right side
    298.35x = 81,939.27
  5. Step 5: Solve for x
    x = 81,939.27/298.35
  6. Step 6: Final answer
    x = 274.64

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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.