Home / 20,790.39-31,205.30-12,868.94

Finding the Fourth Proportional to 20,790.39, 31,205.30 and 12,868.94

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Solution

The fourth proportional to 20,790.39, 31,205.30 and 12,868.94 is: 19,315.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790.39 : 31,205.30 = 12,868.94 : x
  2. Step 2: Convert to fraction form
    20,790.39/31,205.30 = 12,868.94/x
  3. Step 3: Cross multiply
    20,790.39x = 31,205.30 × 12,868.94
  4. Step 4: Simplify right side
    20,790.39x = 401,579,133.38
  5. Step 5: Solve for x
    x = 401,579,133.38/20,790.39
  6. Step 6: Final answer
    x = 19,315.61

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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.