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Finding the Fourth Proportional to 298.26, 411.21 and 286.38

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Solution

The fourth proportional to 298.26, 411.21 and 286.38 is: 394.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.26 : 411.21 = 286.38 : x
  2. Step 2: Convert to fraction form
    298.26/411.21 = 286.38/x
  3. Step 3: Cross multiply
    298.26x = 411.21 × 286.38
  4. Step 4: Simplify right side
    298.26x = 117,762.32
  5. Step 5: Solve for x
    x = 117,762.32/298.26
  6. Step 6: Final answer
    x = 394.83

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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.