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Finding the Fourth Proportional to 355.39, 490.40 and 208.07

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Solution

The fourth proportional to 355.39, 490.40 and 208.07 is: 287.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.39 : 490.40 = 208.07 : x
  2. Step 2: Convert to fraction form
    355.39/490.40 = 208.07/x
  3. Step 3: Cross multiply
    355.39x = 490.40 × 208.07
  4. Step 4: Simplify right side
    355.39x = 102,037.83
  5. Step 5: Solve for x
    x = 102,037.83/355.39
  6. Step 6: Final answer
    x = 287.12

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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.