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Finding the Fourth Proportional to 299.37, 448.82 and 128.49

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Solution

The fourth proportional to 299.37, 448.82 and 128.49 is: 192.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.37 : 448.82 = 128.49 : x
  2. Step 2: Convert to fraction form
    299.37/448.82 = 128.49/x
  3. Step 3: Cross multiply
    299.37x = 448.82 × 128.49
  4. Step 4: Simplify right side
    299.37x = 57,668.24
  5. Step 5: Solve for x
    x = 57,668.24/299.37
  6. Step 6: Final answer
    x = 192.63

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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.