Home / 20,939.16-31,403.94-12,508.04

Finding the Fourth Proportional to 20,939.16, 31,403.94 and 12,508.04

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Solution

The fourth proportional to 20,939.16, 31,403.94 and 12,508.04 is: 18,759.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.16 : 31,403.94 = 12,508.04 : x
  2. Step 2: Convert to fraction form
    20,939.16/31,403.94 = 12,508.04/x
  3. Step 3: Cross multiply
    20,939.16x = 31,403.94 × 12,508.04
  4. Step 4: Simplify right side
    20,939.16x = 392,801,737.68
  5. Step 5: Solve for x
    x = 392,801,737.68/20,939.16
  6. Step 6: Final answer
    x = 18,759.19

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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.