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Finding the Fourth Proportional to 408.85, 612.28 and 203.13

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Solution

The fourth proportional to 408.85, 612.28 and 203.13 is: 304.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.85 : 612.28 = 203.13 : x
  2. Step 2: Convert to fraction form
    408.85/612.28 = 203.13/x
  3. Step 3: Cross multiply
    408.85x = 612.28 × 203.13
  4. Step 4: Simplify right side
    408.85x = 124,372.44
  5. Step 5: Solve for x
    x = 124,372.44/408.85
  6. Step 6: Final answer
    x = 304.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.