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Finding the Fourth Proportional to 289.46, 396.76 and 285.41

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Solution

The fourth proportional to 289.46, 396.76 and 285.41 is: 391.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.46 : 396.76 = 285.41 : x
  2. Step 2: Convert to fraction form
    289.46/396.76 = 285.41/x
  3. Step 3: Cross multiply
    289.46x = 396.76 × 285.41
  4. Step 4: Simplify right side
    289.46x = 113,239.27
  5. Step 5: Solve for x
    x = 113,239.27/289.46
  6. Step 6: Final answer
    x = 391.21

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.