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Finding the Fourth Proportional to 201.69, 278.05 and 149.29

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Solution

The fourth proportional to 201.69, 278.05 and 149.29 is: 205.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.69 : 278.05 = 149.29 : x
  2. Step 2: Convert to fraction form
    201.69/278.05 = 149.29/x
  3. Step 3: Cross multiply
    201.69x = 278.05 × 149.29
  4. Step 4: Simplify right side
    201.69x = 41,510.23
  5. Step 5: Solve for x
    x = 41,510.23/201.69
  6. Step 6: Final answer
    x = 205.81

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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.