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Finding the Fourth Proportional to 12,121.20, 18,181.80 and 9,049.20

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Solution

The fourth proportional to 12,121.20, 18,181.80 and 9,049.20 is: 13,573.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,121.20 : 18,181.80 = 9,049.20 : x
  2. Step 2: Convert to fraction form
    12,121.20/18,181.80 = 9,049.20/x
  3. Step 3: Cross multiply
    12,121.20x = 18,181.80 × 9,049.20
  4. Step 4: Simplify right side
    12,121.20x = 164,530,744.56
  5. Step 5: Solve for x
    x = 164,530,744.56/12,121.20
  6. Step 6: Final answer
    x = 13,573.80

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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.