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Finding the Fourth Proportional to 3,860.70, 5,791.04 and 939

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Solution

The fourth proportional to 3,860.70, 5,791.04 and 939 is: 1,408.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,860.70 : 5,791.04 = 939 : x
  2. Step 2: Convert to fraction form
    3,860.70/5,791.04 = 939/x
  3. Step 3: Cross multiply
    3,860.70x = 5,791.04 × 939
  4. Step 4: Simplify right side
    3,860.70x = 5,437,786.56
  5. Step 5: Solve for x
    x = 5,437,786.56/3,860.70
  6. Step 6: Final answer
    x = 1,408.50

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1.5x scale

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.