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Finding the Fourth Proportional to 800.19, 1,199.10 and 388.85

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Solution

The fourth proportional to 800.19, 1,199.10 and 388.85 is: 582.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.19 : 1,199.10 = 388.85 : x
  2. Step 2: Convert to fraction form
    800.19/1,199.10 = 388.85/x
  3. Step 3: Cross multiply
    800.19x = 1,199.10 × 388.85
  4. Step 4: Simplify right side
    800.19x = 466,273.03
  5. Step 5: Solve for x
    x = 466,273.03/800.19
  6. Step 6: Final answer
    x = 582.70

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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.