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Finding the Fourth Proportional to 298.28, 411.58 and 274.39

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Solution

The fourth proportional to 298.28, 411.58 and 274.39 is: 378.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.28 : 411.58 = 274.39 : x
  2. Step 2: Convert to fraction form
    298.28/411.58 = 274.39/x
  3. Step 3: Cross multiply
    298.28x = 411.58 × 274.39
  4. Step 4: Simplify right side
    298.28x = 112,932.75
  5. Step 5: Solve for x
    x = 112,932.75/298.28
  6. Step 6: Final answer
    x = 378.61

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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.