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Finding the Fourth Proportional to 299.99, 414.99 and 280.42

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Solution

The fourth proportional to 299.99, 414.99 and 280.42 is: 387.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.99 : 414.99 = 280.42 : x
  2. Step 2: Convert to fraction form
    299.99/414.99 = 280.42/x
  3. Step 3: Cross multiply
    299.99x = 414.99 × 280.42
  4. Step 4: Simplify right side
    299.99x = 116,370.46
  5. Step 5: Solve for x
    x = 116,370.46/299.99
  6. Step 6: Final answer
    x = 387.91

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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.