Home / 21,121.32-31,687.97-10,578.61

Finding the Fourth Proportional to 21,121.32, 31,687.97 and 10,578.61

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Solution

The fourth proportional to 21,121.32, 31,687.97 and 10,578.61 is: 15,870.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.32 : 31,687.97 = 10,578.61 : x
  2. Step 2: Convert to fraction form
    21,121.32/31,687.97 = 10,578.61/x
  3. Step 3: Cross multiply
    21,121.32x = 31,687.97 × 10,578.61
  4. Step 4: Simplify right side
    21,121.32x = 335,214,544.21
  5. Step 5: Solve for x
    x = 335,214,544.21/21,121.32
  6. Step 6: Final answer
    x = 15,870.91

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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.