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Finding the Fourth Proportional to 800.87, 1,200.33 and 389.39

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Solution

The fourth proportional to 800.87, 1,200.33 and 389.39 is: 583.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.87 : 1,200.33 = 389.39 : x
  2. Step 2: Convert to fraction form
    800.87/1,200.33 = 389.39/x
  3. Step 3: Cross multiply
    800.87x = 1,200.33 × 389.39
  4. Step 4: Simplify right side
    800.87x = 467,390.50
  5. Step 5: Solve for x
    x = 467,390.50/800.87
  6. Step 6: Final answer
    x = 583.61

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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.