Home / 11,987.99-17,979.87-3,220.85

Finding the Fourth Proportional to 11,987.99, 17,979.87 and 3,220.85

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Solution

The fourth proportional to 11,987.99, 17,979.87 and 3,220.85 is: 4,830.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,987.99 : 17,979.87 = 3,220.85 : x
  2. Step 2: Convert to fraction form
    11,987.99/17,979.87 = 3,220.85/x
  3. Step 3: Cross multiply
    11,987.99x = 17,979.87 × 3,220.85
  4. Step 4: Simplify right side
    11,987.99x = 57,910,464.29
  5. Step 5: Solve for x
    x = 57,910,464.29/11,987.99
  6. Step 6: Final answer
    x = 4,830.71

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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.