Home / 20,379.78-28,123.82-11,427.26

Finding the Fourth Proportional to 20,379.78, 28,123.82 and 11,427.26

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Solution

The fourth proportional to 20,379.78, 28,123.82 and 11,427.26 is: 15,769.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.78 : 28,123.82 = 11,427.26 : x
  2. Step 2: Convert to fraction form
    20,379.78/28,123.82 = 11,427.26/x
  3. Step 3: Cross multiply
    20,379.78x = 28,123.82 × 11,427.26
  4. Step 4: Simplify right side
    20,379.78x = 321,378,203.33
  5. Step 5: Solve for x
    x = 321,378,203.33/20,379.78
  6. Step 6: Final answer
    x = 15,769.46

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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.