Home / 13,820.63-20,730.87-3,959.89

Finding the Fourth Proportional to 13,820.63, 20,730.87 and 3,959.89

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Solution

The fourth proportional to 13,820.63, 20,730.87 and 3,959.89 is: 5,939.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,820.63 : 20,730.87 = 3,959.89 : x
  2. Step 2: Convert to fraction form
    13,820.63/20,730.87 = 3,959.89/x
  3. Step 3: Cross multiply
    13,820.63x = 20,730.87 × 3,959.89
  4. Step 4: Simplify right side
    13,820.63x = 82,091,912.98
  5. Step 5: Solve for x
    x = 82,091,912.98/13,820.63
  6. Step 6: Final answer
    x = 5,939.81

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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.