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Finding the Fourth Proportional to 201.40, 278.22 and 178.12

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Solution

The fourth proportional to 201.40, 278.22 and 178.12 is: 246.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.40 : 278.22 = 178.12 : x
  2. Step 2: Convert to fraction form
    201.40/278.22 = 178.12/x
  3. Step 3: Cross multiply
    201.40x = 278.22 × 178.12
  4. Step 4: Simplify right side
    201.40x = 49,556.55
  5. Step 5: Solve for x
    x = 49,556.55/201.40
  6. Step 6: Final answer
    x = 246.06

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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.