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Finding the Fourth Proportional to 17,915.79, 26,843.76 and 12,642.09

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Solution

The fourth proportional to 17,915.79, 26,843.76 and 12,642.09 is: 18,942.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,915.79 : 26,843.76 = 12,642.09 : x
  2. Step 2: Convert to fraction form
    17,915.79/26,843.76 = 12,642.09/x
  3. Step 3: Cross multiply
    17,915.79x = 26,843.76 × 12,642.09
  4. Step 4: Simplify right side
    17,915.79x = 339,361,229.86
  5. Step 5: Solve for x
    x = 339,361,229.86/17,915.79
  6. Step 6: Final answer
    x = 18,942.02

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.