Home / 21,282.80-31,912.20-8,135.60

Finding the Fourth Proportional to 21,282.80, 31,912.20 and 8,135.60

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Solution

The fourth proportional to 21,282.80, 31,912.20 and 8,135.60 is: 12,198.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,282.80 : 31,912.20 = 8,135.60 : x
  2. Step 2: Convert to fraction form
    21,282.80/31,912.20 = 8,135.60/x
  3. Step 3: Cross multiply
    21,282.80x = 31,912.20 × 8,135.60
  4. Step 4: Simplify right side
    21,282.80x = 259,624,894.32
  5. Step 5: Solve for x
    x = 259,624,894.32/21,282.80
  6. Step 6: Final answer
    x = 12,198.81

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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.