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Finding the Fourth Proportional to 299.10, 447.93 and 257.70

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Solution

The fourth proportional to 299.10, 447.93 and 257.70 is: 385.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.10 : 447.93 = 257.70 : x
  2. Step 2: Convert to fraction form
    299.10/447.93 = 257.70/x
  3. Step 3: Cross multiply
    299.10x = 447.93 × 257.70
  4. Step 4: Simplify right side
    299.10x = 115,431.56
  5. Step 5: Solve for x
    x = 115,431.56/299.10
  6. Step 6: Final answer
    x = 385.93

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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.