Home / 20,780.52-31,180.50-12,022.80

Finding the Fourth Proportional to 20,780.52, 31,180.50 and 12,022.80

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Solution

The fourth proportional to 20,780.52, 31,180.50 and 12,022.80 is: 18,039.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.52 : 31,180.50 = 12,022.80 : x
  2. Step 2: Convert to fraction form
    20,780.52/31,180.50 = 12,022.80/x
  3. Step 3: Cross multiply
    20,780.52x = 31,180.50 × 12,022.80
  4. Step 4: Simplify right side
    20,780.52x = 374,876,915.40
  5. Step 5: Solve for x
    x = 374,876,915.40/20,780.52
  6. Step 6: Final answer
    x = 18,039.82

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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.