Home / 20,383.08-28,129.87-11,431.09

Finding the Fourth Proportional to 20,383.08, 28,129.87 and 11,431.09

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Solution

The fourth proportional to 20,383.08, 28,129.87 and 11,431.09 is: 15,775.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,383.08 : 28,129.87 = 11,431.09 : x
  2. Step 2: Convert to fraction form
    20,383.08/28,129.87 = 11,431.09/x
  3. Step 3: Cross multiply
    20,383.08x = 28,129.87 × 11,431.09
  4. Step 4: Simplify right side
    20,383.08x = 321,555,125.11
  5. Step 5: Solve for x
    x = 321,555,125.11/20,383.08
  6. Step 6: Final answer
    x = 15,775.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.