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Finding the Fourth Proportional to 441.21, 661.68 and 221.61

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Solution

The fourth proportional to 441.21, 661.68 and 221.61 is: 332.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.21 : 661.68 = 221.61 : x
  2. Step 2: Convert to fraction form
    441.21/661.68 = 221.61/x
  3. Step 3: Cross multiply
    441.21x = 661.68 × 221.61
  4. Step 4: Simplify right side
    441.21x = 146,634.90
  5. Step 5: Solve for x
    x = 146,634.90/441.21
  6. Step 6: Final answer
    x = 332.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.