Home / 20,817.78-31,238.97-7,679.38

Finding the Fourth Proportional to 20,817.78, 31,238.97 and 7,679.38

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Solution

The fourth proportional to 20,817.78, 31,238.97 and 7,679.38 is: 11,523.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.78 : 31,238.97 = 7,679.38 : x
  2. Step 2: Convert to fraction form
    20,817.78/31,238.97 = 7,679.38/x
  3. Step 3: Cross multiply
    20,817.78x = 31,238.97 × 7,679.38
  4. Step 4: Simplify right side
    20,817.78x = 239,895,843.34
  5. Step 5: Solve for x
    x = 239,895,843.34/20,817.78
  6. Step 6: Final answer
    x = 11,523.60

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1.5x scale

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.