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Finding the Fourth Proportional to 47,939.88, 71,909.78 and 12,879.53

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Solution

The fourth proportional to 47,939.88, 71,909.78 and 12,879.53 is: 19,319.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,939.88 : 71,909.78 = 12,879.53 : x
  2. Step 2: Convert to fraction form
    47,939.88/71,909.78 = 12,879.53/x
  3. Step 3: Cross multiply
    47,939.88x = 71,909.78 × 12,879.53
  4. Step 4: Simplify right side
    47,939.88x = 926,164,104.41
  5. Step 5: Solve for x
    x = 926,164,104.41/47,939.88
  6. Step 6: Final answer
    x = 19,319.28

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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.