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Finding the Fourth Proportional to 11,891.10, 17,821.16 and 6,625.91

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Solution

The fourth proportional to 11,891.10, 17,821.16 and 6,625.91 is: 9,930.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,891.10 : 17,821.16 = 6,625.91 : x
  2. Step 2: Convert to fraction form
    11,891.10/17,821.16 = 6,625.91/x
  3. Step 3: Cross multiply
    11,891.10x = 17,821.16 × 6,625.91
  4. Step 4: Simplify right side
    11,891.10x = 118,081,280.02
  5. Step 5: Solve for x
    x = 118,081,280.02/11,891.10
  6. Step 6: Final answer
    x = 9,930.22

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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.