Home / 20,455.92-28,229.88-11,505

Finding the Fourth Proportional to 20,455.92, 28,229.88 and 11,505

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Solution

The fourth proportional to 20,455.92, 28,229.88 and 11,505 is: 15,877.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,455.92 : 28,229.88 = 11,505 : x
  2. Step 2: Convert to fraction form
    20,455.92/28,229.88 = 11,505/x
  3. Step 3: Cross multiply
    20,455.92x = 28,229.88 × 11,505
  4. Step 4: Simplify right side
    20,455.92x = 324,784,769.40
  5. Step 5: Solve for x
    x = 324,784,769.40/20,455.92
  6. Step 6: Final answer
    x = 15,877.30

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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.