Home / 19,917.20-29,879.40-8,231.60

Finding the Fourth Proportional to 19,917.20, 29,879.40 and 8,231.60

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Solution

The fourth proportional to 19,917.20, 29,879.40 and 8,231.60 is: 12,348.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,917.20 : 29,879.40 = 8,231.60 : x
  2. Step 2: Convert to fraction form
    19,917.20/29,879.40 = 8,231.60/x
  3. Step 3: Cross multiply
    19,917.20x = 29,879.40 × 8,231.60
  4. Step 4: Simplify right side
    19,917.20x = 245,955,269.04
  5. Step 5: Solve for x
    x = 245,955,269.04/19,917.20
  6. Step 6: Final answer
    x = 12,348.89

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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.