Home / 20,940.72-31,418.37-9,855.87

Finding the Fourth Proportional to 20,940.72, 31,418.37 and 9,855.87

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Solution

The fourth proportional to 20,940.72, 31,418.37 and 9,855.87 is: 14,787.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.72 : 31,418.37 = 9,855.87 : x
  2. Step 2: Convert to fraction form
    20,940.72/31,418.37 = 9,855.87/x
  3. Step 3: Cross multiply
    20,940.72x = 31,418.37 × 9,855.87
  4. Step 4: Simplify right side
    20,940.72x = 309,655,163.96
  5. Step 5: Solve for x
    x = 309,655,163.96/20,940.72
  6. Step 6: Final answer
    x = 14,787.23

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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.