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Finding the Fourth Proportional to 201.75, 278.44 and 123.12

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Solution

The fourth proportional to 201.75, 278.44 and 123.12 is: 169.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.75 : 278.44 = 123.12 : x
  2. Step 2: Convert to fraction form
    201.75/278.44 = 123.12/x
  3. Step 3: Cross multiply
    201.75x = 278.44 × 123.12
  4. Step 4: Simplify right side
    201.75x = 34,280.14
  5. Step 5: Solve for x
    x = 34,280.14/201.75
  6. Step 6: Final answer
    x = 169.91

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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.