Home / 20,769.20-28,660.50-11,815.86

Finding the Fourth Proportional to 20,769.20, 28,660.50 and 11,815.86

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Solution

The fourth proportional to 20,769.20, 28,660.50 and 11,815.86 is: 16,305.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,769.20 : 28,660.50 = 11,815.86 : x
  2. Step 2: Convert to fraction form
    20,769.20/28,660.50 = 11,815.86/x
  3. Step 3: Cross multiply
    20,769.20x = 28,660.50 × 11,815.86
  4. Step 4: Simplify right side
    20,769.20x = 338,648,455.53
  5. Step 5: Solve for x
    x = 338,648,455.53/20,769.20
  6. Step 6: Final answer
    x = 16,305.32

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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.