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Finding the Fourth Proportional to 208,321.80, 312,487.56 and 75,212.88

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Solution

The fourth proportional to 208,321.80, 312,487.56 and 75,212.88 is: 112,821.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,321.80 : 312,487.56 = 75,212.88 : x
  2. Step 2: Convert to fraction form
    208,321.80/312,487.56 = 75,212.88/x
  3. Step 3: Cross multiply
    208,321.80x = 312,487.56 × 75,212.88
  4. Step 4: Simplify right side
    208,321.80x = 23,503,089,351.77
  5. Step 5: Solve for x
    x = 23,503,089,351.77/208,321.80
  6. Step 6: Final answer
    x = 112,821.07

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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.