Home / 7,855.20-11,782.40-2,661.12

Finding the Fourth Proportional to 7,855.20, 11,782.40 and 2,661.12

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Solution

The fourth proportional to 7,855.20, 11,782.40 and 2,661.12 is: 3,991.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,855.20 : 11,782.40 = 2,661.12 : x
  2. Step 2: Convert to fraction form
    7,855.20/11,782.40 = 2,661.12/x
  3. Step 3: Cross multiply
    7,855.20x = 11,782.40 × 2,661.12
  4. Step 4: Simplify right side
    7,855.20x = 31,354,380.29
  5. Step 5: Solve for x
    x = 31,354,380.29/7,855.20
  6. Step 6: Final answer
    x = 3,991.54

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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.