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Finding the Fourth Proportional to 201.76, 278.45 and 123.09

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Solution

The fourth proportional to 201.76, 278.45 and 123.09 is: 169.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.76 : 278.45 = 123.09 : x
  2. Step 2: Convert to fraction form
    201.76/278.45 = 123.09/x
  3. Step 3: Cross multiply
    201.76x = 278.45 × 123.09
  4. Step 4: Simplify right side
    201.76x = 34,274.41
  5. Step 5: Solve for x
    x = 34,274.41/201.76
  6. Step 6: Final answer
    x = 169.88

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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.