Home / 3,855.20-5,782.80-1,911.20

Finding the Fourth Proportional to 3,855.20, 5,782.80 and 1,911.20

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Solution

The fourth proportional to 3,855.20, 5,782.80 and 1,911.20 is: 2,866.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,855.20 : 5,782.80 = 1,911.20 : x
  2. Step 2: Convert to fraction form
    3,855.20/5,782.80 = 1,911.20/x
  3. Step 3: Cross multiply
    3,855.20x = 5,782.80 × 1,911.20
  4. Step 4: Simplify right side
    3,855.20x = 11,052,087.36
  5. Step 5: Solve for x
    x = 11,052,087.36/3,855.20
  6. Step 6: Final answer
    x = 2,866.80

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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.