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Finding the Fourth Proportional to 18,687.20, 27,982.20 and 12,077.60

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Solution

The fourth proportional to 18,687.20, 27,982.20 and 12,077.60 is: 18,084.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.20 : 27,982.20 = 12,077.60 : x
  2. Step 2: Convert to fraction form
    18,687.20/27,982.20 = 12,077.60/x
  3. Step 3: Cross multiply
    18,687.20x = 27,982.20 × 12,077.60
  4. Step 4: Simplify right side
    18,687.20x = 337,957,818.72
  5. Step 5: Solve for x
    x = 337,957,818.72/18,687.20
  6. Step 6: Final answer
    x = 18,084.99

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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.