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Finding the Fourth Proportional to 355.23, 490.22 and 215.42

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Solution

The fourth proportional to 355.23, 490.22 and 215.42 is: 297.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.23 : 490.22 = 215.42 : x
  2. Step 2: Convert to fraction form
    355.23/490.22 = 215.42/x
  3. Step 3: Cross multiply
    355.23x = 490.22 × 215.42
  4. Step 4: Simplify right side
    355.23x = 105,599.66
  5. Step 5: Solve for x
    x = 105,599.66/355.23
  6. Step 6: Final answer
    x = 297.27

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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.