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Finding the Fourth Proportional to 5,189.82, 7,783.89 and 1,491.20

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Solution

The fourth proportional to 5,189.82, 7,783.89 and 1,491.20 is: 2,236.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,189.82 : 7,783.89 = 1,491.20 : x
  2. Step 2: Convert to fraction form
    5,189.82/7,783.89 = 1,491.20/x
  3. Step 3: Cross multiply
    5,189.82x = 7,783.89 × 1,491.20
  4. Step 4: Simplify right side
    5,189.82x = 11,607,348.77
  5. Step 5: Solve for x
    x = 11,607,348.77/5,189.82
  6. Step 6: Final answer
    x = 2,236.56

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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.