Home / 20,811.80-31,217.70-12,069.20

Finding the Fourth Proportional to 20,811.80, 31,217.70 and 12,069.20

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Solution

The fourth proportional to 20,811.80, 31,217.70 and 12,069.20 is: 18,103.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.80 : 31,217.70 = 12,069.20 : x
  2. Step 2: Convert to fraction form
    20,811.80/31,217.70 = 12,069.20/x
  3. Step 3: Cross multiply
    20,811.80x = 31,217.70 × 12,069.20
  4. Step 4: Simplify right side
    20,811.80x = 376,772,664.84
  5. Step 5: Solve for x
    x = 376,772,664.84/20,811.80
  6. Step 6: Final answer
    x = 18,103.80

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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.