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Finding the Fourth Proportional to 20,189.80, 30,279.30 and 7,040.80

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Solution

The fourth proportional to 20,189.80, 30,279.30 and 7,040.80 is: 10,559.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,189.80 : 30,279.30 = 7,040.80 : x
  2. Step 2: Convert to fraction form
    20,189.80/30,279.30 = 7,040.80/x
  3. Step 3: Cross multiply
    20,189.80x = 30,279.30 × 7,040.80
  4. Step 4: Simplify right side
    20,189.80x = 213,190,495.44
  5. Step 5: Solve for x
    x = 213,190,495.44/20,189.80
  6. Step 6: Final answer
    x = 10,559.32

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1.5x scale

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.