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Finding the Fourth Proportional to 289.15, 399.14 and 196.38

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Solution

The fourth proportional to 289.15, 399.14 and 196.38 is: 271.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.15 : 399.14 = 196.38 : x
  2. Step 2: Convert to fraction form
    289.15/399.14 = 196.38/x
  3. Step 3: Cross multiply
    289.15x = 399.14 × 196.38
  4. Step 4: Simplify right side
    289.15x = 78,383.11
  5. Step 5: Solve for x
    x = 78,383.11/289.15
  6. Step 6: Final answer
    x = 271.08

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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.