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Finding the Fourth Proportional to 384.78, 576.90 and 238.44

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Solution

The fourth proportional to 384.78, 576.90 and 238.44 is: 357.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.78 : 576.90 = 238.44 : x
  2. Step 2: Convert to fraction form
    384.78/576.90 = 238.44/x
  3. Step 3: Cross multiply
    384.78x = 576.90 × 238.44
  4. Step 4: Simplify right side
    384.78x = 137,556.04
  5. Step 5: Solve for x
    x = 137,556.04/384.78
  6. Step 6: Final answer
    x = 357.49

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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.