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Finding the Fourth Proportional to 298.99, 414.31 and 280.72

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Solution

The fourth proportional to 298.99, 414.31 and 280.72 is: 388.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.99 : 414.31 = 280.72 : x
  2. Step 2: Convert to fraction form
    298.99/414.31 = 280.72/x
  3. Step 3: Cross multiply
    298.99x = 414.31 × 280.72
  4. Step 4: Simplify right side
    298.99x = 116,305.10
  5. Step 5: Solve for x
    x = 116,305.10/298.99
  6. Step 6: Final answer
    x = 388.99

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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.