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Finding the Fourth Proportional to 298.78, 411.96 and 283.39

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Solution

The fourth proportional to 298.78, 411.96 and 283.39 is: 390.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.78 : 411.96 = 283.39 : x
  2. Step 2: Convert to fraction form
    298.78/411.96 = 283.39/x
  3. Step 3: Cross multiply
    298.78x = 411.96 × 283.39
  4. Step 4: Simplify right side
    298.78x = 116,745.34
  5. Step 5: Solve for x
    x = 116,745.34/298.78
  6. Step 6: Final answer
    x = 390.74

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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.