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Finding the Fourth Proportional to 398.37, 549.78 and 223.71

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Solution

The fourth proportional to 398.37, 549.78 and 223.71 is: 308.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.37 : 549.78 = 223.71 : x
  2. Step 2: Convert to fraction form
    398.37/549.78 = 223.71/x
  3. Step 3: Cross multiply
    398.37x = 549.78 × 223.71
  4. Step 4: Simplify right side
    398.37x = 122,991.28
  5. Step 5: Solve for x
    x = 122,991.28/398.37
  6. Step 6: Final answer
    x = 308.74

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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.