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Finding the Fourth Proportional to 355.59, 490.68 and 208.26

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Solution

The fourth proportional to 355.59, 490.68 and 208.26 is: 287.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.59 : 490.68 = 208.26 : x
  2. Step 2: Convert to fraction form
    355.59/490.68 = 208.26/x
  3. Step 3: Cross multiply
    355.59x = 490.68 × 208.26
  4. Step 4: Simplify right side
    355.59x = 102,189.02
  5. Step 5: Solve for x
    x = 102,189.02/355.59
  6. Step 6: Final answer
    x = 287.38

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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.