Home / 20,511.81-30,769.37-5,720.87

Finding the Fourth Proportional to 20,511.81, 30,769.37 and 5,720.87

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Solution

The fourth proportional to 20,511.81, 30,769.37 and 5,720.87 is: 8,581.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,511.81 : 30,769.37 = 5,720.87 : x
  2. Step 2: Convert to fraction form
    20,511.81/30,769.37 = 5,720.87/x
  3. Step 3: Cross multiply
    20,511.81x = 30,769.37 × 5,720.87
  4. Step 4: Simplify right side
    20,511.81x = 176,027,383.30
  5. Step 5: Solve for x
    x = 176,027,383.30/20,511.81
  6. Step 6: Final answer
    x = 8,581.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.