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Finding the Fourth Proportional to 298.61, 411.87 and 219.95

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Solution

The fourth proportional to 298.61, 411.87 and 219.95 is: 303.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.61 : 411.87 = 219.95 : x
  2. Step 2: Convert to fraction form
    298.61/411.87 = 219.95/x
  3. Step 3: Cross multiply
    298.61x = 411.87 × 219.95
  4. Step 4: Simplify right side
    298.61x = 90,590.81
  5. Step 5: Solve for x
    x = 90,590.81/298.61
  6. Step 6: Final answer
    x = 303.37

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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.