Home / 20,976.28-31,469.87-7,828.75

Finding the Fourth Proportional to 20,976.28, 31,469.87 and 7,828.75

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Solution

The fourth proportional to 20,976.28, 31,469.87 and 7,828.75 is: 11,745.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,976.28 : 31,469.87 = 7,828.75 : x
  2. Step 2: Convert to fraction form
    20,976.28/31,469.87 = 7,828.75/x
  3. Step 3: Cross multiply
    20,976.28x = 31,469.87 × 7,828.75
  4. Step 4: Simplify right side
    20,976.28x = 246,369,744.76
  5. Step 5: Solve for x
    x = 246,369,744.76/20,976.28
  6. Step 6: Final answer
    x = 11,745.16

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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.