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Finding the Fourth Proportional to 79,986.72, 119,728.46 and 54,879.96

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Solution

The fourth proportional to 79,986.72, 119,728.46 and 54,879.96 is: 82,147.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,986.72 : 119,728.46 = 54,879.96 : x
  2. Step 2: Convert to fraction form
    79,986.72/119,728.46 = 54,879.96/x
  3. Step 3: Cross multiply
    79,986.72x = 119,728.46 × 54,879.96
  4. Step 4: Simplify right side
    79,986.72x = 6,570,693,095.66
  5. Step 5: Solve for x
    x = 6,570,693,095.66/79,986.72
  6. Step 6: Final answer
    x = 82,147.30

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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.