Home / 3,855.21-5,782.84-1,388.30

Finding the Fourth Proportional to 3,855.21, 5,782.84 and 1,388.30

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Solution

The fourth proportional to 3,855.21, 5,782.84 and 1,388.30 is: 2,082.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,855.21 : 5,782.84 = 1,388.30 : x
  2. Step 2: Convert to fraction form
    3,855.21/5,782.84 = 1,388.30/x
  3. Step 3: Cross multiply
    3,855.21x = 5,782.84 × 1,388.30
  4. Step 4: Simplify right side
    3,855.21x = 8,028,324.72
  5. Step 5: Solve for x
    x = 8,028,324.72/3,855.21
  6. Step 6: Final answer
    x = 2,082.46

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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.