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Finding the Fourth Proportional to 5,711.67, 7,879.79 and 3,721.50

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Solution

The fourth proportional to 5,711.67, 7,879.79 and 3,721.50 is: 5,134.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,711.67 : 7,879.79 = 3,721.50 : x
  2. Step 2: Convert to fraction form
    5,711.67/7,879.79 = 3,721.50/x
  3. Step 3: Cross multiply
    5,711.67x = 7,879.79 × 3,721.50
  4. Step 4: Simplify right side
    5,711.67x = 29,324,619.88
  5. Step 5: Solve for x
    x = 29,324,619.88/5,711.67
  6. Step 6: Final answer
    x = 5,134.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.