Home / 20,786.20-31,179.30-5,203.80

Finding the Fourth Proportional to 20,786.20, 31,179.30 and 5,203.80

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Solution

The fourth proportional to 20,786.20, 31,179.30 and 5,203.80 is: 7,805.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,786.20 : 31,179.30 = 5,203.80 : x
  2. Step 2: Convert to fraction form
    20,786.20/31,179.30 = 5,203.80/x
  3. Step 3: Cross multiply
    20,786.20x = 31,179.30 × 5,203.80
  4. Step 4: Simplify right side
    20,786.20x = 162,250,841.34
  5. Step 5: Solve for x
    x = 162,250,841.34/20,786.20
  6. Step 6: Final answer
    x = 7,805.70

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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.