Home / 20,806.12-31,217.06-12,491.94

Finding the Fourth Proportional to 20,806.12, 31,217.06 and 12,491.94

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Solution

The fourth proportional to 20,806.12, 31,217.06 and 12,491.94 is: 18,742.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,806.12 : 31,217.06 = 12,491.94 : x
  2. Step 2: Convert to fraction form
    20,806.12/31,217.06 = 12,491.94/x
  3. Step 3: Cross multiply
    20,806.12x = 31,217.06 × 12,491.94
  4. Step 4: Simplify right side
    20,806.12x = 389,961,578.04
  5. Step 5: Solve for x
    x = 389,961,578.04/20,806.12
  6. Step 6: Final answer
    x = 18,742.64

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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.