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Finding the Fourth Proportional to 201.92, 278.61 and 128.18

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Solution

The fourth proportional to 201.92, 278.61 and 128.18 is: 176.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.92 : 278.61 = 128.18 : x
  2. Step 2: Convert to fraction form
    201.92/278.61 = 128.18/x
  3. Step 3: Cross multiply
    201.92x = 278.61 × 128.18
  4. Step 4: Simplify right side
    201.92x = 35,712.23
  5. Step 5: Solve for x
    x = 35,712.23/201.92
  6. Step 6: Final answer
    x = 176.86

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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.