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Finding the Fourth Proportional to 298.39, 411.78 and 208.68

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Solution

The fourth proportional to 298.39, 411.78 and 208.68 is: 287.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.39 : 411.78 = 208.68 : x
  2. Step 2: Convert to fraction form
    298.39/411.78 = 208.68/x
  3. Step 3: Cross multiply
    298.39x = 411.78 × 208.68
  4. Step 4: Simplify right side
    298.39x = 85,928.19
  5. Step 5: Solve for x
    x = 85,928.19/298.39
  6. Step 6: Final answer
    x = 287.98

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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.