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Finding the Fourth Proportional to 353.72, 488.21 and 206.34

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Solution

The fourth proportional to 353.72, 488.21 and 206.34 is: 284.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.72 : 488.21 = 206.34 : x
  2. Step 2: Convert to fraction form
    353.72/488.21 = 206.34/x
  3. Step 3: Cross multiply
    353.72x = 488.21 × 206.34
  4. Step 4: Simplify right side
    353.72x = 100,736.22
  5. Step 5: Solve for x
    x = 100,736.22/353.72
  6. Step 6: Final answer
    x = 284.79

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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.