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Finding the Fourth Proportional to 18,644.85, 25,728.44 and 11,569.91

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Solution

The fourth proportional to 18,644.85, 25,728.44 and 11,569.91 is: 15,965.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,644.85 : 25,728.44 = 11,569.91 : x
  2. Step 2: Convert to fraction form
    18,644.85/25,728.44 = 11,569.91/x
  3. Step 3: Cross multiply
    18,644.85x = 25,728.44 × 11,569.91
  4. Step 4: Simplify right side
    18,644.85x = 297,675,548.75
  5. Step 5: Solve for x
    x = 297,675,548.75/18,644.85
  6. Step 6: Final answer
    x = 15,965.56

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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.