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Finding the Fourth Proportional to 355.14, 490.07 and 215.21

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Solution

The fourth proportional to 355.14, 490.07 and 215.21 is: 296.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.14 : 490.07 = 215.21 : x
  2. Step 2: Convert to fraction form
    355.14/490.07 = 215.21/x
  3. Step 3: Cross multiply
    355.14x = 490.07 × 215.21
  4. Step 4: Simplify right side
    355.14x = 105,469.73
  5. Step 5: Solve for x
    x = 105,469.73/355.14
  6. Step 6: Final answer
    x = 296.98

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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.