Home / 20,560.05-28,372.91-11,128.61

Finding the Fourth Proportional to 20,560.05, 28,372.91 and 11,128.61

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Solution

The fourth proportional to 20,560.05, 28,372.91 and 11,128.61 is: 15,357.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,560.05 : 28,372.91 = 11,128.61 : x
  2. Step 2: Convert to fraction form
    20,560.05/28,372.91 = 11,128.61/x
  3. Step 3: Cross multiply
    20,560.05x = 28,372.91 × 11,128.61
  4. Step 4: Simplify right side
    20,560.05x = 315,751,049.96
  5. Step 5: Solve for x
    x = 315,751,049.96/20,560.05
  6. Step 6: Final answer
    x = 15,357.50

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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.