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Finding the Fourth Proportional to 355.69, 490.83 and 208.34

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Solution

The fourth proportional to 355.69, 490.83 and 208.34 is: 287.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.69 : 490.83 = 208.34 : x
  2. Step 2: Convert to fraction form
    355.69/490.83 = 208.34/x
  3. Step 3: Cross multiply
    355.69x = 490.83 × 208.34
  4. Step 4: Simplify right side
    355.69x = 102,257.07
  5. Step 5: Solve for x
    x = 102,257.07/355.69
  6. Step 6: Final answer
    x = 287.49

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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.