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Finding the Fourth Proportional to 36,608.40, 54,839.70 and 21,007.80

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Solution

The fourth proportional to 36,608.40, 54,839.70 and 21,007.80 is: 31,469.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    36,608.40 : 54,839.70 = 21,007.80 : x
  2. Step 2: Convert to fraction form
    36,608.40/54,839.70 = 21,007.80/x
  3. Step 3: Cross multiply
    36,608.40x = 54,839.70 × 21,007.80
  4. Step 4: Simplify right side
    36,608.40x = 1,152,061,449.66
  5. Step 5: Solve for x
    x = 1,152,061,449.66/36,608.40
  6. Step 6: Final answer
    x = 31,469.87

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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.