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Finding the Fourth Proportional to 18,819.20, 28,212.48 and 7,131.36

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Solution

The fourth proportional to 18,819.20, 28,212.48 and 7,131.36 is: 10,690.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.20 : 28,212.48 = 7,131.36 : x
  2. Step 2: Convert to fraction form
    18,819.20/28,212.48 = 7,131.36/x
  3. Step 3: Cross multiply
    18,819.20x = 28,212.48 × 7,131.36
  4. Step 4: Simplify right side
    18,819.20x = 201,193,351.37
  5. Step 5: Solve for x
    x = 201,193,351.37/18,819.20
  6. Step 6: Final answer
    x = 10,690.86

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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.