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Finding the Fourth Proportional to 208,611.69, 312,930.74 and 80,589.03

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Solution

The fourth proportional to 208,611.69, 312,930.74 and 80,589.03 is: 120,888.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,611.69 : 312,930.74 = 80,589.03 : x
  2. Step 2: Convert to fraction form
    208,611.69/312,930.74 = 80,589.03/x
  3. Step 3: Cross multiply
    208,611.69x = 312,930.74 × 80,589.03
  4. Step 4: Simplify right side
    208,611.69x = 25,218,784,793.78
  5. Step 5: Solve for x
    x = 25,218,784,793.78/208,611.69
  6. Step 6: Final answer
    x = 120,888.65

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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.