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Finding the Fourth Proportional to 201.95, 278.72 and 128.26

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Solution

The fourth proportional to 201.95, 278.72 and 128.26 is: 177.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.95 : 278.72 = 128.26 : x
  2. Step 2: Convert to fraction form
    201.95/278.72 = 128.26/x
  3. Step 3: Cross multiply
    201.95x = 278.72 × 128.26
  4. Step 4: Simplify right side
    201.95x = 35,748.63
  5. Step 5: Solve for x
    x = 35,748.63/201.95
  6. Step 6: Final answer
    x = 177.02

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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.