Home / 20,379.33-28,122.93-11,427.39

Finding the Fourth Proportional to 20,379.33, 28,122.93 and 11,427.39

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Solution

The fourth proportional to 20,379.33, 28,122.93 and 11,427.39 is: 15,769.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.33 : 28,122.93 = 11,427.39 : x
  2. Step 2: Convert to fraction form
    20,379.33/28,122.93 = 11,427.39/x
  3. Step 3: Cross multiply
    20,379.33x = 28,122.93 × 11,427.39
  4. Step 4: Simplify right side
    20,379.33x = 321,371,689.05
  5. Step 5: Solve for x
    x = 321,371,689.05/20,379.33
  6. Step 6: Final answer
    x = 15,769.49

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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.