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Finding the Fourth Proportional to 298.18, 411.18 and 215.68

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Solution

The fourth proportional to 298.18, 411.18 and 215.68 is: 297.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.18 : 411.18 = 215.68 : x
  2. Step 2: Convert to fraction form
    298.18/411.18 = 215.68/x
  3. Step 3: Cross multiply
    298.18x = 411.18 × 215.68
  4. Step 4: Simplify right side
    298.18x = 88,683.30
  5. Step 5: Solve for x
    x = 88,683.30/298.18
  6. Step 6: Final answer
    x = 297.42

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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.