Home / 20,691.82-28,555.35-11,739.70

Finding the Fourth Proportional to 20,691.82, 28,555.35 and 11,739.70

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Solution

The fourth proportional to 20,691.82, 28,555.35 and 11,739.70 is: 16,201.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.82 : 28,555.35 = 11,739.70 : x
  2. Step 2: Convert to fraction form
    20,691.82/28,555.35 = 11,739.70/x
  3. Step 3: Cross multiply
    20,691.82x = 28,555.35 × 11,739.70
  4. Step 4: Simplify right side
    20,691.82x = 335,231,128.97
  5. Step 5: Solve for x
    x = 335,231,128.97/20,691.82
  6. Step 6: Final answer
    x = 16,201.15

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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.