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Finding the Fourth Proportional to 201.92, 278.76 and 128.36

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Solution

The fourth proportional to 201.92, 278.76 and 128.36 is: 177.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.92 : 278.76 = 128.36 : x
  2. Step 2: Convert to fraction form
    201.92/278.76 = 128.36/x
  3. Step 3: Cross multiply
    201.92x = 278.76 × 128.36
  4. Step 4: Simplify right side
    201.92x = 35,781.63
  5. Step 5: Solve for x
    x = 35,781.63/201.92
  6. Step 6: Final answer
    x = 177.21

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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.