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Finding the Fourth Proportional to 31,497, 47,245.68 and 8,121.84

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Solution

The fourth proportional to 31,497, 47,245.68 and 8,121.84 is: 12,182.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,497 : 47,245.68 = 8,121.84 : x
  2. Step 2: Convert to fraction form
    31,497/47,245.68 = 8,121.84/x
  3. Step 3: Cross multiply
    31,497x = 47,245.68 × 8,121.84
  4. Step 4: Simplify right side
    31,497x = 383,721,853.65
  5. Step 5: Solve for x
    x = 383,721,853.65/31,497
  6. Step 6: Final answer
    x = 12,182.81

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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.