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Finding the Fourth Proportional to 353.21, 487.49 and 222.26

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Solution

The fourth proportional to 353.21, 487.49 and 222.26 is: 306.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.21 : 487.49 = 222.26 : x
  2. Step 2: Convert to fraction form
    353.21/487.49 = 222.26/x
  3. Step 3: Cross multiply
    353.21x = 487.49 × 222.26
  4. Step 4: Simplify right side
    353.21x = 108,345.98
  5. Step 5: Solve for x
    x = 108,345.98/353.21
  6. Step 6: Final answer
    x = 306.75

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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.