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Finding the Fourth Proportional to 12,481.20, 18,709.80 and 7,210.80

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Solution

The fourth proportional to 12,481.20, 18,709.80 and 7,210.80 is: 10,809.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,481.20 : 18,709.80 = 7,210.80 : x
  2. Step 2: Convert to fraction form
    12,481.20/18,709.80 = 7,210.80/x
  3. Step 3: Cross multiply
    12,481.20x = 18,709.80 × 7,210.80
  4. Step 4: Simplify right side
    12,481.20x = 134,912,625.84
  5. Step 5: Solve for x
    x = 134,912,625.84/12,481.20
  6. Step 6: Final answer
    x = 10,809.27

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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.