Home / 20,868.91-31,313.49-9,180.61

Finding the Fourth Proportional to 20,868.91, 31,313.49 and 9,180.61

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Solution

The fourth proportional to 20,868.91, 31,313.49 and 9,180.61 is: 13,775.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.91 : 31,313.49 = 9,180.61 : x
  2. Step 2: Convert to fraction form
    20,868.91/31,313.49 = 9,180.61/x
  3. Step 3: Cross multiply
    20,868.91x = 31,313.49 × 9,180.61
  4. Step 4: Simplify right side
    20,868.91x = 287,476,939.43
  5. Step 5: Solve for x
    x = 287,476,939.43/20,868.91
  6. Step 6: Final answer
    x = 13,775.37

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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.