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Finding the Fourth Proportional to 408.38, 612.54 and 213.38

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Solution

The fourth proportional to 408.38, 612.54 and 213.38 is: 320.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.38 : 612.54 = 213.38 : x
  2. Step 2: Convert to fraction form
    408.38/612.54 = 213.38/x
  3. Step 3: Cross multiply
    408.38x = 612.54 × 213.38
  4. Step 4: Simplify right side
    408.38x = 130,703.79
  5. Step 5: Solve for x
    x = 130,703.79/408.38
  6. Step 6: Final answer
    x = 320.05

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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.