Home / 20,761.78-31,147.62-6,721.82

Finding the Fourth Proportional to 20,761.78, 31,147.62 and 6,721.82

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Solution

The fourth proportional to 20,761.78, 31,147.62 and 6,721.82 is: 10,084.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,761.78 : 31,147.62 = 6,721.82 : x
  2. Step 2: Convert to fraction form
    20,761.78/31,147.62 = 6,721.82/x
  3. Step 3: Cross multiply
    20,761.78x = 31,147.62 × 6,721.82
  4. Step 4: Simplify right side
    20,761.78x = 209,368,505.72
  5. Step 5: Solve for x
    x = 209,368,505.72/20,761.78
  6. Step 6: Final answer
    x = 10,084.32

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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.