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Finding the Fourth Proportional to 299.78, 449.42 and 256.28

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Solution

The fourth proportional to 299.78, 449.42 and 256.28 is: 384.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.78 : 449.42 = 256.28 : x
  2. Step 2: Convert to fraction form
    299.78/449.42 = 256.28/x
  3. Step 3: Cross multiply
    299.78x = 449.42 × 256.28
  4. Step 4: Simplify right side
    299.78x = 115,177.36
  5. Step 5: Solve for x
    x = 115,177.36/299.78
  6. Step 6: Final answer
    x = 384.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.