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Finding the Fourth Proportional to 355.79, 490.86 and 208.37

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Solution

The fourth proportional to 355.79, 490.86 and 208.37 is: 287.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.79 : 490.86 = 208.37 : x
  2. Step 2: Convert to fraction form
    355.79/490.86 = 208.37/x
  3. Step 3: Cross multiply
    355.79x = 490.86 × 208.37
  4. Step 4: Simplify right side
    355.79x = 102,281.73
  5. Step 5: Solve for x
    x = 102,281.73/355.79
  6. Step 6: Final answer
    x = 287.48

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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.