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Finding the Fourth Proportional to 298.44, 411.46 and 208.72

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Solution

The fourth proportional to 298.44, 411.46 and 208.72 is: 287.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.44 : 411.46 = 208.72 : x
  2. Step 2: Convert to fraction form
    298.44/411.46 = 208.72/x
  3. Step 3: Cross multiply
    298.44x = 411.46 × 208.72
  4. Step 4: Simplify right side
    298.44x = 85,879.93
  5. Step 5: Solve for x
    x = 85,879.93/298.44
  6. Step 6: Final answer
    x = 287.76

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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.