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Finding the Fourth Proportional to 7,481.20, 11,221.80 and 6,638.80

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Solution

The fourth proportional to 7,481.20, 11,221.80 and 6,638.80 is: 9,958.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,481.20 : 11,221.80 = 6,638.80 : x
  2. Step 2: Convert to fraction form
    7,481.20/11,221.80 = 6,638.80/x
  3. Step 3: Cross multiply
    7,481.20x = 11,221.80 × 6,638.80
  4. Step 4: Simplify right side
    7,481.20x = 74,499,285.84
  5. Step 5: Solve for x
    x = 74,499,285.84/7,481.20
  6. Step 6: Final answer
    x = 9,958.20

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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.