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Finding the Fourth Proportional to 397.99, 549.21 and 223.35

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Solution

The fourth proportional to 397.99, 549.21 and 223.35 is: 308.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.99 : 549.21 = 223.35 : x
  2. Step 2: Convert to fraction form
    397.99/549.21 = 223.35/x
  3. Step 3: Cross multiply
    397.99x = 549.21 × 223.35
  4. Step 4: Simplify right side
    397.99x = 122,666.05
  5. Step 5: Solve for x
    x = 122,666.05/397.99
  6. Step 6: Final answer
    x = 308.21

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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.