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Finding the Fourth Proportional to 398.67, 550.16 and 221.63

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Solution

The fourth proportional to 398.67, 550.16 and 221.63 is: 305.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.67 : 550.16 = 221.63 : x
  2. Step 2: Convert to fraction form
    398.67/550.16 = 221.63/x
  3. Step 3: Cross multiply
    398.67x = 550.16 × 221.63
  4. Step 4: Simplify right side
    398.67x = 121,928.10
  5. Step 5: Solve for x
    x = 121,928.10/398.67
  6. Step 6: Final answer
    x = 305.84

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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.