Home / 20,879.98-28,815.45-11,928.47

Finding the Fourth Proportional to 20,879.98, 28,815.45 and 11,928.47

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Solution

The fourth proportional to 20,879.98, 28,815.45 and 11,928.47 is: 16,461.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.98 : 28,815.45 = 11,928.47 : x
  2. Step 2: Convert to fraction form
    20,879.98/28,815.45 = 11,928.47/x
  3. Step 3: Cross multiply
    20,879.98x = 28,815.45 × 11,928.47
  4. Step 4: Simplify right side
    20,879.98x = 343,724,042.05
  5. Step 5: Solve for x
    x = 343,724,042.05/20,879.98
  6. Step 6: Final answer
    x = 16,461.90

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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.