Home / 20,942.79-31,414.11-5,147.88

Finding the Fourth Proportional to 20,942.79, 31,414.11 and 5,147.88

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Solution

The fourth proportional to 20,942.79, 31,414.11 and 5,147.88 is: 7,721.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,942.79 : 31,414.11 = 5,147.88 : x
  2. Step 2: Convert to fraction form
    20,942.79/31,414.11 = 5,147.88/x
  3. Step 3: Cross multiply
    20,942.79x = 31,414.11 × 5,147.88
  4. Step 4: Simplify right side
    20,942.79x = 161,715,911.52
  5. Step 5: Solve for x
    x = 161,715,911.52/20,942.79
  6. Step 6: Final answer
    x = 7,721.80

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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.