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Finding the Fourth Proportional to 201.62, 301.86 and 139.79

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Solution

The fourth proportional to 201.62, 301.86 and 139.79 is: 209.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.62 : 301.86 = 139.79 : x
  2. Step 2: Convert to fraction form
    201.62/301.86 = 139.79/x
  3. Step 3: Cross multiply
    201.62x = 301.86 × 139.79
  4. Step 4: Simplify right side
    201.62x = 42,197.76
  5. Step 5: Solve for x
    x = 42,197.76/201.62
  6. Step 6: Final answer
    x = 209.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.