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Finding the Fourth Proportional to 401.26, 553.74 and 221.80

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Solution

The fourth proportional to 401.26, 553.74 and 221.80 is: 306.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.26 : 553.74 = 221.80 : x
  2. Step 2: Convert to fraction form
    401.26/553.74 = 221.80/x
  3. Step 3: Cross multiply
    401.26x = 553.74 × 221.80
  4. Step 4: Simplify right side
    401.26x = 122,815.65
  5. Step 5: Solve for x
    x = 122,815.65/401.26
  6. Step 6: Final answer
    x = 306.08

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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.