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Finding the Fourth Proportional to 12,661.80, 18,994.76 and 3,896.72

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Solution

The fourth proportional to 12,661.80, 18,994.76 and 3,896.72 is: 5,845.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,661.80 : 18,994.76 = 3,896.72 : x
  2. Step 2: Convert to fraction form
    12,661.80/18,994.76 = 3,896.72/x
  3. Step 3: Cross multiply
    12,661.80x = 18,994.76 × 3,896.72
  4. Step 4: Simplify right side
    12,661.80x = 74,017,261.19
  5. Step 5: Solve for x
    x = 74,017,261.19/12,661.80
  6. Step 6: Final answer
    x = 5,845.71

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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.