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Finding the Fourth Proportional to 513.18, 768.78 and 238.92

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Solution

The fourth proportional to 513.18, 768.78 and 238.92 is: 357.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.18 : 768.78 = 238.92 : x
  2. Step 2: Convert to fraction form
    513.18/768.78 = 238.92/x
  3. Step 3: Cross multiply
    513.18x = 768.78 × 238.92
  4. Step 4: Simplify right side
    513.18x = 183,676.92
  5. Step 5: Solve for x
    x = 183,676.92/513.18
  6. Step 6: Final answer
    x = 357.92

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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.