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Finding the Fourth Proportional to 275.78, 380.05 and 201.96

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Solution

The fourth proportional to 275.78, 380.05 and 201.96 is: 278.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.78 : 380.05 = 201.96 : x
  2. Step 2: Convert to fraction form
    275.78/380.05 = 201.96/x
  3. Step 3: Cross multiply
    275.78x = 380.05 × 201.96
  4. Step 4: Simplify right side
    275.78x = 76,754.39
  5. Step 5: Solve for x
    x = 76,754.39/275.78
  6. Step 6: Final answer
    x = 278.31

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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.