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Finding the Fourth Proportional to 201.61, 278.20 and 122.96

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Solution

The fourth proportional to 201.61, 278.20 and 122.96 is: 169.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.61 : 278.20 = 122.96 : x
  2. Step 2: Convert to fraction form
    201.61/278.20 = 122.96/x
  3. Step 3: Cross multiply
    201.61x = 278.20 × 122.96
  4. Step 4: Simplify right side
    201.61x = 34,207.86
  5. Step 5: Solve for x
    x = 34,207.86/201.61
  6. Step 6: Final answer
    x = 169.68

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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.