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Finding the Fourth Proportional to 201.58, 278.19 and 122.90

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Solution

The fourth proportional to 201.58, 278.19 and 122.90 is: 169.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.58 : 278.19 = 122.90 : x
  2. Step 2: Convert to fraction form
    201.58/278.19 = 122.90/x
  3. Step 3: Cross multiply
    201.58x = 278.19 × 122.90
  4. Step 4: Simplify right side
    201.58x = 34,188.16
  5. Step 5: Solve for x
    x = 34,188.16/201.58
  6. Step 6: Final answer
    x = 169.60

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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.