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Finding the Fourth Proportional to 15,821.78, 21,834.04 and 8,651.73

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Solution

The fourth proportional to 15,821.78, 21,834.04 and 8,651.73 is: 11,939.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,821.78 : 21,834.04 = 8,651.73 : x
  2. Step 2: Convert to fraction form
    15,821.78/21,834.04 = 8,651.73/x
  3. Step 3: Cross multiply
    15,821.78x = 21,834.04 × 8,651.73
  4. Step 4: Simplify right side
    15,821.78x = 188,902,218.89
  5. Step 5: Solve for x
    x = 188,902,218.89/15,821.78
  6. Step 6: Final answer
    x = 11,939.38

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1.5x scale

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.