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Finding the Fourth Proportional to 379.42, 568.41 and 216.61

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Solution

The fourth proportional to 379.42, 568.41 and 216.61 is: 324.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.42 : 568.41 = 216.61 : x
  2. Step 2: Convert to fraction form
    379.42/568.41 = 216.61/x
  3. Step 3: Cross multiply
    379.42x = 568.41 × 216.61
  4. Step 4: Simplify right side
    379.42x = 123,123.29
  5. Step 5: Solve for x
    x = 123,123.29/379.42
  6. Step 6: Final answer
    x = 324.50

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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.