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Finding the Fourth Proportional to 325.80, 449.68 and 221.06

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Solution

The fourth proportional to 325.80, 449.68 and 221.06 is: 305.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.80 : 449.68 = 221.06 : x
  2. Step 2: Convert to fraction form
    325.80/449.68 = 221.06/x
  3. Step 3: Cross multiply
    325.80x = 449.68 × 221.06
  4. Step 4: Simplify right side
    325.80x = 99,404.58
  5. Step 5: Solve for x
    x = 99,404.58/325.80
  6. Step 6: Final answer
    x = 305.11

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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.