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Finding the Fourth Proportional to 201.28, 277.55 and 139.20

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Solution

The fourth proportional to 201.28, 277.55 and 139.20 is: 191.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.28 : 277.55 = 139.20 : x
  2. Step 2: Convert to fraction form
    201.28/277.55 = 139.20/x
  3. Step 3: Cross multiply
    201.28x = 277.55 × 139.20
  4. Step 4: Simplify right side
    201.28x = 38,634.96
  5. Step 5: Solve for x
    x = 38,634.96/201.28
  6. Step 6: Final answer
    x = 191.95

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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.