Home / 21,163.92-31,731.50-12,711.39

Finding the Fourth Proportional to 21,163.92, 31,731.50 and 12,711.39

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Solution

The fourth proportional to 21,163.92, 31,731.50 and 12,711.39 is: 19,058.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,163.92 : 31,731.50 = 12,711.39 : x
  2. Step 2: Convert to fraction form
    21,163.92/31,731.50 = 12,711.39/x
  3. Step 3: Cross multiply
    21,163.92x = 31,731.50 × 12,711.39
  4. Step 4: Simplify right side
    21,163.92x = 403,351,249.57
  5. Step 5: Solve for x
    x = 403,351,249.57/21,163.92
  6. Step 6: Final answer
    x = 19,058.44

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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.