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Finding the Fourth Proportional to 201.89, 278.31 and 142.69

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Solution

The fourth proportional to 201.89, 278.31 and 142.69 is: 196.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.89 : 278.31 = 142.69 : x
  2. Step 2: Convert to fraction form
    201.89/278.31 = 142.69/x
  3. Step 3: Cross multiply
    201.89x = 278.31 × 142.69
  4. Step 4: Simplify right side
    201.89x = 39,711.70
  5. Step 5: Solve for x
    x = 39,711.70/201.89
  6. Step 6: Final answer
    x = 196.70

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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.