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Finding the Fourth Proportional to 7,481, 11,221.50 and 2,009

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Solution

The fourth proportional to 7,481, 11,221.50 and 2,009 is: 3,013.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,481 : 11,221.50 = 2,009 : x
  2. Step 2: Convert to fraction form
    7,481/11,221.50 = 2,009/x
  3. Step 3: Cross multiply
    7,481x = 11,221.50 × 2,009
  4. Step 4: Simplify right side
    7,481x = 22,543,993.50
  5. Step 5: Solve for x
    x = 22,543,993.50/7,481
  6. Step 6: Final answer
    x = 3,013.50

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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.