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Finding the Fourth Proportional to 12,661.97, 18,991.53 and 3,895.88

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Solution

The fourth proportional to 12,661.97, 18,991.53 and 3,895.88 is: 5,843.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,661.97 : 18,991.53 = 3,895.88 : x
  2. Step 2: Convert to fraction form
    12,661.97/18,991.53 = 3,895.88/x
  3. Step 3: Cross multiply
    12,661.97x = 18,991.53 × 3,895.88
  4. Step 4: Simplify right side
    12,661.97x = 73,988,626.94
  5. Step 5: Solve for x
    x = 73,988,626.94/12,661.97
  6. Step 6: Final answer
    x = 5,843.38

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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.