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Finding the Fourth Proportional to 67,003.84, 100,520.34 and 20,255.50

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Solution

The fourth proportional to 67,003.84, 100,520.34 and 20,255.50 is: 30,387.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,003.84 : 100,520.34 = 20,255.50 : x
  2. Step 2: Convert to fraction form
    67,003.84/100,520.34 = 20,255.50/x
  3. Step 3: Cross multiply
    67,003.84x = 100,520.34 × 20,255.50
  4. Step 4: Simplify right side
    67,003.84x = 2,036,089,746.87
  5. Step 5: Solve for x
    x = 2,036,089,746.87/67,003.84
  6. Step 6: Final answer
    x = 30,387.66

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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.