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Finding the Fourth Proportional to 11,891.10, 17,821.15 and 6,625.90

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Solution

The fourth proportional to 11,891.10, 17,821.15 and 6,625.90 is: 9,930.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,891.10 : 17,821.15 = 6,625.90 : x
  2. Step 2: Convert to fraction form
    11,891.10/17,821.15 = 6,625.90/x
  3. Step 3: Cross multiply
    11,891.10x = 17,821.15 × 6,625.90
  4. Step 4: Simplify right side
    11,891.10x = 118,081,157.79
  5. Step 5: Solve for x
    x = 118,081,157.79/11,891.10
  6. Step 6: Final answer
    x = 9,930.21

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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.