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Finding the Fourth Proportional to 201.97, 278.87 and 155.27

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Solution

The fourth proportional to 201.97, 278.87 and 155.27 is: 214.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.97 : 278.87 = 155.27 : x
  2. Step 2: Convert to fraction form
    201.97/278.87 = 155.27/x
  3. Step 3: Cross multiply
    201.97x = 278.87 × 155.27
  4. Step 4: Simplify right side
    201.97x = 43,298.75
  5. Step 5: Solve for x
    x = 43,298.75/201.97
  6. Step 6: Final answer
    x = 214.39

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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.