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Finding the Fourth Proportional to 299.49, 415 and 281.22

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Solution

The fourth proportional to 299.49, 415 and 281.22 is: 389.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.49 : 415 = 281.22 : x
  2. Step 2: Convert to fraction form
    299.49/415 = 281.22/x
  3. Step 3: Cross multiply
    299.49x = 415 × 281.22
  4. Step 4: Simplify right side
    299.49x = 116,706.30
  5. Step 5: Solve for x
    x = 116,706.30/299.49
  6. Step 6: Final answer
    x = 389.68

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.