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Finding the Fourth Proportional to 201.94, 278.56 and 128.12

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Solution

The fourth proportional to 201.94, 278.56 and 128.12 is: 176.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.94 : 278.56 = 128.12 : x
  2. Step 2: Convert to fraction form
    201.94/278.56 = 128.12/x
  3. Step 3: Cross multiply
    201.94x = 278.56 × 128.12
  4. Step 4: Simplify right side
    201.94x = 35,689.11
  5. Step 5: Solve for x
    x = 35,689.11/201.94
  6. Step 6: Final answer
    x = 176.73

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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.