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Finding the Fourth Proportional to 384.67, 579.78 and 331.21

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Solution

The fourth proportional to 384.67, 579.78 and 331.21 is: 499.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.67 : 579.78 = 331.21 : x
  2. Step 2: Convert to fraction form
    384.67/579.78 = 331.21/x
  3. Step 3: Cross multiply
    384.67x = 579.78 × 331.21
  4. Step 4: Simplify right side
    384.67x = 192,028.93
  5. Step 5: Solve for x
    x = 192,028.93/384.67
  6. Step 6: Final answer
    x = 499.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.