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Finding the Fourth Proportional to 379.28, 568.20 and 216.47

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Solution

The fourth proportional to 379.28, 568.20 and 216.47 is: 324.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.28 : 568.20 = 216.47 : x
  2. Step 2: Convert to fraction form
    379.28/568.20 = 216.47/x
  3. Step 3: Cross multiply
    379.28x = 568.20 × 216.47
  4. Step 4: Simplify right side
    379.28x = 122,996.22
  5. Step 5: Solve for x
    x = 122,996.22/379.28
  6. Step 6: Final answer
    x = 324.29

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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.