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Finding the Fourth Proportional to 201.18, 278.28 and 178.20

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Solution

The fourth proportional to 201.18, 278.28 and 178.20 is: 246.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.18 : 278.28 = 178.20 : x
  2. Step 2: Convert to fraction form
    201.18/278.28 = 178.20/x
  3. Step 3: Cross multiply
    201.18x = 278.28 × 178.20
  4. Step 4: Simplify right side
    201.18x = 49,589.50
  5. Step 5: Solve for x
    x = 49,589.50/201.18
  6. Step 6: Final answer
    x = 246.49

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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.