Home / 20,856.69-31,281.78-6,816.61

Finding the Fourth Proportional to 20,856.69, 31,281.78 and 6,816.61

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Solution

The fourth proportional to 20,856.69, 31,281.78 and 6,816.61 is: 10,223.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.69 : 31,281.78 = 6,816.61 : x
  2. Step 2: Convert to fraction form
    20,856.69/31,281.78 = 6,816.61/x
  3. Step 3: Cross multiply
    20,856.69x = 31,281.78 × 6,816.61
  4. Step 4: Simplify right side
    20,856.69x = 213,235,694.37
  5. Step 5: Solve for x
    x = 213,235,694.37/20,856.69
  6. Step 6: Final answer
    x = 10,223.85

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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.