Home / 20,951.82-28,912.31-11,520.39

Finding the Fourth Proportional to 20,951.82, 28,912.31 and 11,520.39

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Solution

The fourth proportional to 20,951.82, 28,912.31 and 11,520.39 is: 15,897.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.82 : 28,912.31 = 11,520.39 : x
  2. Step 2: Convert to fraction form
    20,951.82/28,912.31 = 11,520.39/x
  3. Step 3: Cross multiply
    20,951.82x = 28,912.31 × 11,520.39
  4. Step 4: Simplify right side
    20,951.82x = 333,081,029.40
  5. Step 5: Solve for x
    x = 333,081,029.40/20,951.82
  6. Step 6: Final answer
    x = 15,897.47

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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.