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Finding the Fourth Proportional to 11,939.99, 17,910.16 and 4,545.20

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Solution

The fourth proportional to 11,939.99, 17,910.16 and 4,545.20 is: 6,817.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,939.99 : 17,910.16 = 4,545.20 : x
  2. Step 2: Convert to fraction form
    11,939.99/17,910.16 = 4,545.20/x
  3. Step 3: Cross multiply
    11,939.99x = 17,910.16 × 4,545.20
  4. Step 4: Simplify right side
    11,939.99x = 81,405,293.02
  5. Step 5: Solve for x
    x = 81,405,293.02/11,939.99
  6. Step 6: Final answer
    x = 6,817.87

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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.