Home / 20,789.87-28,689.99-11,229.75

Finding the Fourth Proportional to 20,789.87, 28,689.99 and 11,229.75

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Solution

The fourth proportional to 20,789.87, 28,689.99 and 11,229.75 is: 15,497.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.87 : 28,689.99 = 11,229.75 : x
  2. Step 2: Convert to fraction form
    20,789.87/28,689.99 = 11,229.75/x
  3. Step 3: Cross multiply
    20,789.87x = 28,689.99 × 11,229.75
  4. Step 4: Simplify right side
    20,789.87x = 322,181,415.20
  5. Step 5: Solve for x
    x = 322,181,415.20/20,789.87
  6. Step 6: Final answer
    x = 15,497.04

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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.