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Finding the Fourth Proportional to 201.55, 278.26 and 138.64

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Solution

The fourth proportional to 201.55, 278.26 and 138.64 is: 191.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.55 : 278.26 = 138.64 : x
  2. Step 2: Convert to fraction form
    201.55/278.26 = 138.64/x
  3. Step 3: Cross multiply
    201.55x = 278.26 × 138.64
  4. Step 4: Simplify right side
    201.55x = 38,576.58
  5. Step 5: Solve for x
    x = 38,576.58/201.55
  6. Step 6: Final answer
    x = 191.40

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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.