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Finding the Fourth Proportional to 298.43, 411.89 and 215.81

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Solution

The fourth proportional to 298.43, 411.89 and 215.81 is: 297.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.43 : 411.89 = 215.81 : x
  2. Step 2: Convert to fraction form
    298.43/411.89 = 215.81/x
  3. Step 3: Cross multiply
    298.43x = 411.89 × 215.81
  4. Step 4: Simplify right side
    298.43x = 88,890.70
  5. Step 5: Solve for x
    x = 88,890.70/298.43
  6. Step 6: Final answer
    x = 297.86

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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.