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Finding the Fourth Proportional to 18,704.93, 25,812.79 and 11,990.55

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Solution

The fourth proportional to 18,704.93, 25,812.79 and 11,990.55 is: 16,546.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,704.93 : 25,812.79 = 11,990.55 : x
  2. Step 2: Convert to fraction form
    18,704.93/25,812.79 = 11,990.55/x
  3. Step 3: Cross multiply
    18,704.93x = 25,812.79 × 11,990.55
  4. Step 4: Simplify right side
    18,704.93x = 309,509,549.13
  5. Step 5: Solve for x
    x = 309,509,549.13/18,704.93
  6. Step 6: Final answer
    x = 16,546.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.