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Finding the Fourth Proportional to 31,917.70, 47,879.88 and 12,212.74

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Solution

The fourth proportional to 31,917.70, 47,879.88 and 12,212.74 is: 18,320.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,917.70 : 47,879.88 = 12,212.74 : x
  2. Step 2: Convert to fraction form
    31,917.70/47,879.88 = 12,212.74/x
  3. Step 3: Cross multiply
    31,917.70x = 47,879.88 × 12,212.74
  4. Step 4: Simplify right side
    31,917.70x = 584,744,525.67
  5. Step 5: Solve for x
    x = 584,744,525.67/31,917.70
  6. Step 6: Final answer
    x = 18,320.38

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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.