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Finding the Fourth Proportional to 773.75, 1,161.44 and 389

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Solution

The fourth proportional to 773.75, 1,161.44 and 389 is: 583.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.75 : 1,161.44 = 389 : x
  2. Step 2: Convert to fraction form
    773.75/1,161.44 = 389/x
  3. Step 3: Cross multiply
    773.75x = 1,161.44 × 389
  4. Step 4: Simplify right side
    773.75x = 451,800.16
  5. Step 5: Solve for x
    x = 451,800.16/773.75
  6. Step 6: Final answer
    x = 583.91

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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.