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Finding the Fourth Proportional to 355.15, 490 and 224.20

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Solution

The fourth proportional to 355.15, 490 and 224.20 is: 309.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.15 : 490 = 224.20 : x
  2. Step 2: Convert to fraction form
    355.15/490 = 224.20/x
  3. Step 3: Cross multiply
    355.15x = 490 × 224.20
  4. Step 4: Simplify right side
    355.15x = 109,858
  5. Step 5: Solve for x
    x = 109,858/355.15
  6. Step 6: Final answer
    x = 309.33

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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.