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Finding the Fourth Proportional to 355.18, 490.21 and 224.26

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Solution

The fourth proportional to 355.18, 490.21 and 224.26 is: 309.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.18 : 490.21 = 224.26 : x
  2. Step 2: Convert to fraction form
    355.18/490.21 = 224.26/x
  3. Step 3: Cross multiply
    355.18x = 490.21 × 224.26
  4. Step 4: Simplify right side
    355.18x = 109,934.49
  5. Step 5: Solve for x
    x = 109,934.49/355.18
  6. Step 6: Final answer
    x = 309.52

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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.