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Finding the Fourth Proportional to 800.20, 1,199.43 and 388.42

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Solution

The fourth proportional to 800.20, 1,199.43 and 388.42 is: 582.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.20 : 1,199.43 = 388.42 : x
  2. Step 2: Convert to fraction form
    800.20/1,199.43 = 388.42/x
  3. Step 3: Cross multiply
    800.20x = 1,199.43 × 388.42
  4. Step 4: Simplify right side
    800.20x = 465,876.60
  5. Step 5: Solve for x
    x = 465,876.60/800.20
  6. Step 6: Final answer
    x = 582.20

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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.