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Finding the Fourth Proportional to 12,979.89, 19,469.88 and 3,745.89

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Solution

The fourth proportional to 12,979.89, 19,469.88 and 3,745.89 is: 5,618.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,979.89 : 19,469.88 = 3,745.89 : x
  2. Step 2: Convert to fraction form
    12,979.89/19,469.88 = 3,745.89/x
  3. Step 3: Cross multiply
    12,979.89x = 19,469.88 × 3,745.89
  4. Step 4: Simplify right side
    12,979.89x = 72,932,028.79
  5. Step 5: Solve for x
    x = 72,932,028.79/12,979.89
  6. Step 6: Final answer
    x = 5,618.85

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1.5x scale

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.