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Finding the Fourth Proportional to 355.40, 490.14 and 217.40

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Solution

The fourth proportional to 355.40, 490.14 and 217.40 is: 299.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.40 : 490.14 = 217.40 : x
  2. Step 2: Convert to fraction form
    355.40/490.14 = 217.40/x
  3. Step 3: Cross multiply
    355.40x = 490.14 × 217.40
  4. Step 4: Simplify right side
    355.40x = 106,556.44
  5. Step 5: Solve for x
    x = 106,556.44/355.40
  6. Step 6: Final answer
    x = 299.82

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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.