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Finding the Fourth Proportional to 799.77, 1,200.11 and 389.00

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Solution

The fourth proportional to 799.77, 1,200.11 and 389.00 is: 583.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.77 : 1,200.11 = 389.00 : x
  2. Step 2: Convert to fraction form
    799.77/1,200.11 = 389.00/x
  3. Step 3: Cross multiply
    799.77x = 1,200.11 × 389.00
  4. Step 4: Simplify right side
    799.77x = 466,834.84
  5. Step 5: Solve for x
    x = 466,834.84/799.77
  6. Step 6: Final answer
    x = 583.71

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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.