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Finding the Fourth Proportional to 201.72, 278.48 and 123.06

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Solution

The fourth proportional to 201.72, 278.48 and 123.06 is: 169.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.72 : 278.48 = 123.06 : x
  2. Step 2: Convert to fraction form
    201.72/278.48 = 123.06/x
  3. Step 3: Cross multiply
    201.72x = 278.48 × 123.06
  4. Step 4: Simplify right side
    201.72x = 34,269.75
  5. Step 5: Solve for x
    x = 34,269.75/201.72
  6. Step 6: Final answer
    x = 169.89

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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.