Home / 21,696.81-29,943.11-12,139.85

Finding the Fourth Proportional to 21,696.81, 29,943.11 and 12,139.85

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Solution

The fourth proportional to 21,696.81, 29,943.11 and 12,139.85 is: 16,753.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,696.81 : 29,943.11 = 12,139.85 : x
  2. Step 2: Convert to fraction form
    21,696.81/29,943.11 = 12,139.85/x
  3. Step 3: Cross multiply
    21,696.81x = 29,943.11 × 12,139.85
  4. Step 4: Simplify right side
    21,696.81x = 363,504,653.52
  5. Step 5: Solve for x
    x = 363,504,653.52/21,696.81
  6. Step 6: Final answer
    x = 16,753.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.