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Finding the Fourth Proportional to 12,660.96, 18,991.38 and 3,426.96

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Solution

The fourth proportional to 12,660.96, 18,991.38 and 3,426.96 is: 5,140.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,660.96 : 18,991.38 = 3,426.96 : x
  2. Step 2: Convert to fraction form
    12,660.96/18,991.38 = 3,426.96/x
  3. Step 3: Cross multiply
    12,660.96x = 18,991.38 × 3,426.96
  4. Step 4: Simplify right side
    12,660.96x = 65,082,699.60
  5. Step 5: Solve for x
    x = 65,082,699.60/12,660.96
  6. Step 6: Final answer
    x = 5,140.42

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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.