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Finding the Fourth Proportional to 355.48, 490.56 and 208.18

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Solution

The fourth proportional to 355.48, 490.56 and 208.18 is: 287.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.48 : 490.56 = 208.18 : x
  2. Step 2: Convert to fraction form
    355.48/490.56 = 208.18/x
  3. Step 3: Cross multiply
    355.48x = 490.56 × 208.18
  4. Step 4: Simplify right side
    355.48x = 102,124.78
  5. Step 5: Solve for x
    x = 102,124.78/355.48
  6. Step 6: Final answer
    x = 287.29

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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.