Home / 20,721.62-31,027.07-12,380.94

Finding the Fourth Proportional to 20,721.62, 31,027.07 and 12,380.94

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Solution

The fourth proportional to 20,721.62, 31,027.07 and 12,380.94 is: 18,538.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.62 : 31,027.07 = 12,380.94 : x
  2. Step 2: Convert to fraction form
    20,721.62/31,027.07 = 12,380.94/x
  3. Step 3: Cross multiply
    20,721.62x = 31,027.07 × 12,380.94
  4. Step 4: Simplify right side
    20,721.62x = 384,144,230.14
  5. Step 5: Solve for x
    x = 384,144,230.14/20,721.62
  6. Step 6: Final answer
    x = 18,538.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.