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Finding the Fourth Proportional to 354.21, 488.99 and 229.97

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Solution

The fourth proportional to 354.21, 488.99 and 229.97 is: 317.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.21 : 488.99 = 229.97 : x
  2. Step 2: Convert to fraction form
    354.21/488.99 = 229.97/x
  3. Step 3: Cross multiply
    354.21x = 488.99 × 229.97
  4. Step 4: Simplify right side
    354.21x = 112,449.44
  5. Step 5: Solve for x
    x = 112,449.44/354.21
  6. Step 6: Final answer
    x = 317.47

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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.