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Finding the Fourth Proportional to 31,914.80, 47,872.20 and 12,183.20

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Solution

The fourth proportional to 31,914.80, 47,872.20 and 12,183.20 is: 18,274.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,914.80 : 47,872.20 = 12,183.20 : x
  2. Step 2: Convert to fraction form
    31,914.80/47,872.20 = 12,183.20/x
  3. Step 3: Cross multiply
    31,914.80x = 47,872.20 × 12,183.20
  4. Step 4: Simplify right side
    31,914.80x = 583,236,587.04
  5. Step 5: Solve for x
    x = 583,236,587.04/31,914.80
  6. Step 6: Final answer
    x = 18,274.80

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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.