Home / 20,986.85-28,962.92-11,912.85

Finding the Fourth Proportional to 20,986.85, 28,962.92 and 11,912.85

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Solution

The fourth proportional to 20,986.85, 28,962.92 and 11,912.85 is: 16,440.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.85 : 28,962.92 = 11,912.85 : x
  2. Step 2: Convert to fraction form
    20,986.85/28,962.92 = 11,912.85/x
  3. Step 3: Cross multiply
    20,986.85x = 28,962.92 × 11,912.85
  4. Step 4: Simplify right side
    20,986.85x = 345,030,789.55
  5. Step 5: Solve for x
    x = 345,030,789.55/20,986.85
  6. Step 6: Final answer
    x = 16,440.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.