Home / 20,689.25-28,551.17-11,257.88

Finding the Fourth Proportional to 20,689.25, 28,551.17 and 11,257.88

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Solution

The fourth proportional to 20,689.25, 28,551.17 and 11,257.88 is: 15,535.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.25 : 28,551.17 = 11,257.88 : x
  2. Step 2: Convert to fraction form
    20,689.25/28,551.17 = 11,257.88/x
  3. Step 3: Cross multiply
    20,689.25x = 28,551.17 × 11,257.88
  4. Step 4: Simplify right side
    20,689.25x = 321,425,589.43
  5. Step 5: Solve for x
    x = 321,425,589.43/20,689.25
  6. Step 6: Final answer
    x = 15,535.87

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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.