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Finding the Fourth Proportional to 201.96, 278.66 and 128.22

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Solution

The fourth proportional to 201.96, 278.66 and 128.22 is: 176.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.96 : 278.66 = 128.22 : x
  2. Step 2: Convert to fraction form
    201.96/278.66 = 128.22/x
  3. Step 3: Cross multiply
    201.96x = 278.66 × 128.22
  4. Step 4: Simplify right side
    201.96x = 35,729.14
  5. Step 5: Solve for x
    x = 35,729.14/201.96
  6. Step 6: Final answer
    x = 176.91

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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.