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Finding the Fourth Proportional to 398.36, 549.61 and 324.55

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Solution

The fourth proportional to 398.36, 549.61 and 324.55 is: 447.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.36 : 549.61 = 324.55 : x
  2. Step 2: Convert to fraction form
    398.36/549.61 = 324.55/x
  3. Step 3: Cross multiply
    398.36x = 549.61 × 324.55
  4. Step 4: Simplify right side
    398.36x = 178,374.30
  5. Step 5: Solve for x
    x = 178,374.30/398.36
  6. Step 6: Final answer
    x = 447.77

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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.