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Finding the Fourth Proportional to 355.47, 490.58 and 208.09

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Solution

The fourth proportional to 355.47, 490.58 and 208.09 is: 287.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.47 : 490.58 = 208.09 : x
  2. Step 2: Convert to fraction form
    355.47/490.58 = 208.09/x
  3. Step 3: Cross multiply
    355.47x = 490.58 × 208.09
  4. Step 4: Simplify right side
    355.47x = 102,084.79
  5. Step 5: Solve for x
    x = 102,084.79/355.47
  6. Step 6: Final answer
    x = 287.18

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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.