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Finding the Fourth Proportional to 12,660.03, 18,990.72 and 3,900.96

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Solution

The fourth proportional to 12,660.03, 18,990.72 and 3,900.96 is: 5,851.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,660.03 : 18,990.72 = 3,900.96 : x
  2. Step 2: Convert to fraction form
    12,660.03/18,990.72 = 3,900.96/x
  3. Step 3: Cross multiply
    12,660.03x = 18,990.72 × 3,900.96
  4. Step 4: Simplify right side
    12,660.03x = 74,082,039.09
  5. Step 5: Solve for x
    x = 74,082,039.09/12,660.03
  6. Step 6: Final answer
    x = 5,851.65

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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.