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Finding the Fourth Proportional to 7,491.67, 11,237.78 and 2,811.20

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Solution

The fourth proportional to 7,491.67, 11,237.78 and 2,811.20 is: 4,216.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,491.67 : 11,237.78 = 2,811.20 : x
  2. Step 2: Convert to fraction form
    7,491.67/11,237.78 = 2,811.20/x
  3. Step 3: Cross multiply
    7,491.67x = 11,237.78 × 2,811.20
  4. Step 4: Simplify right side
    7,491.67x = 31,591,647.14
  5. Step 5: Solve for x
    x = 31,591,647.14/7,491.67
  6. Step 6: Final answer
    x = 4,216.90

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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.