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Finding the Fourth Proportional to 201.69, 278.22 and 136.21

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Solution

The fourth proportional to 201.69, 278.22 and 136.21 is: 187.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.69 : 278.22 = 136.21 : x
  2. Step 2: Convert to fraction form
    201.69/278.22 = 136.21/x
  3. Step 3: Cross multiply
    201.69x = 278.22 × 136.21
  4. Step 4: Simplify right side
    201.69x = 37,896.35
  5. Step 5: Solve for x
    x = 37,896.35/201.69
  6. Step 6: Final answer
    x = 187.89

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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.