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Finding the Fourth Proportional to 355.99, 490.80 and 245.29

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Solution

The fourth proportional to 355.99, 490.80 and 245.29 is: 338.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.99 : 490.80 = 245.29 : x
  2. Step 2: Convert to fraction form
    355.99/490.80 = 245.29/x
  3. Step 3: Cross multiply
    355.99x = 490.80 × 245.29
  4. Step 4: Simplify right side
    355.99x = 120,388.33
  5. Step 5: Solve for x
    x = 120,388.33/355.99
  6. Step 6: Final answer
    x = 338.18

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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.