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Finding the Fourth Proportional to 27,939.40, 41,905.05 and 8,215.90

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Solution

The fourth proportional to 27,939.40, 41,905.05 and 8,215.90 is: 12,322.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,939.40 : 41,905.05 = 8,215.90 : x
  2. Step 2: Convert to fraction form
    27,939.40/41,905.05 = 8,215.90/x
  3. Step 3: Cross multiply
    27,939.40x = 41,905.05 × 8,215.90
  4. Step 4: Simplify right side
    27,939.40x = 344,287,700.30
  5. Step 5: Solve for x
    x = 344,287,700.30/27,939.40
  6. Step 6: Final answer
    x = 12,322.66

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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.