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Finding the Fourth Proportional to 289.39, 399.38 and 196.33

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Solution

The fourth proportional to 289.39, 399.38 and 196.33 is: 270.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.39 : 399.38 = 196.33 : x
  2. Step 2: Convert to fraction form
    289.39/399.38 = 196.33/x
  3. Step 3: Cross multiply
    289.39x = 399.38 × 196.33
  4. Step 4: Simplify right side
    289.39x = 78,409.77
  5. Step 5: Solve for x
    x = 78,409.77/289.39
  6. Step 6: Final answer
    x = 270.95

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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.