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Finding the Fourth Proportional to 397.81, 549.03 and 223.21

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Solution

The fourth proportional to 397.81, 549.03 and 223.21 is: 308.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.81 : 549.03 = 223.21 : x
  2. Step 2: Convert to fraction form
    397.81/549.03 = 223.21/x
  3. Step 3: Cross multiply
    397.81x = 549.03 × 223.21
  4. Step 4: Simplify right side
    397.81x = 122,548.99
  5. Step 5: Solve for x
    x = 122,548.99/397.81
  6. Step 6: Final answer
    x = 308.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.