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Finding the Fourth Proportional to 201.72, 278.28 and 136.11

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Solution

The fourth proportional to 201.72, 278.28 and 136.11 is: 187.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.72 : 278.28 = 136.11 : x
  2. Step 2: Convert to fraction form
    201.72/278.28 = 136.11/x
  3. Step 3: Cross multiply
    201.72x = 278.28 × 136.11
  4. Step 4: Simplify right side
    201.72x = 37,876.69
  5. Step 5: Solve for x
    x = 37,876.69/201.72
  6. Step 6: Final answer
    x = 187.77

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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.