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Finding the Fourth Proportional to 298.79, 447.78 and 225.61

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Solution

The fourth proportional to 298.79, 447.78 and 225.61 is: 338.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.79 : 447.78 = 225.61 : x
  2. Step 2: Convert to fraction form
    298.79/447.78 = 225.61/x
  3. Step 3: Cross multiply
    298.79x = 447.78 × 225.61
  4. Step 4: Simplify right side
    298.79x = 101,022.53
  5. Step 5: Solve for x
    x = 101,022.53/298.79
  6. Step 6: Final answer
    x = 338.10

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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.