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Finding the Fourth Proportional to 289.85, 399.74 and 196.56

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Solution

The fourth proportional to 289.85, 399.74 and 196.56 is: 271.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.85 : 399.74 = 196.56 : x
  2. Step 2: Convert to fraction form
    289.85/399.74 = 196.56/x
  3. Step 3: Cross multiply
    289.85x = 399.74 × 196.56
  4. Step 4: Simplify right side
    289.85x = 78,571.91
  5. Step 5: Solve for x
    x = 78,571.91/289.85
  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.