Home / 20,789.89-31,204.55-12,868.44

Finding the Fourth Proportional to 20,789.89, 31,204.55 and 12,868.44

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Solution

The fourth proportional to 20,789.89, 31,204.55 and 12,868.44 is: 19,314.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.89 : 31,204.55 = 12,868.44 : x
  2. Step 2: Convert to fraction form
    20,789.89/31,204.55 = 12,868.44/x
  3. Step 3: Cross multiply
    20,789.89x = 31,204.55 × 12,868.44
  4. Step 4: Simplify right side
    20,789.89x = 401,553,815.06
  5. Step 5: Solve for x
    x = 401,553,815.06/20,789.89
  6. Step 6: Final answer
    x = 19,314.86

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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.