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Finding the Fourth Proportional to 67,242.80, 100,869.72 and 20,496.08

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Solution

The fourth proportional to 67,242.80, 100,869.72 and 20,496.08 is: 30,745.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,242.80 : 100,869.72 = 20,496.08 : x
  2. Step 2: Convert to fraction form
    67,242.80/100,869.72 = 20,496.08/x
  3. Step 3: Cross multiply
    67,242.80x = 100,869.72 × 20,496.08
  4. Step 4: Simplify right side
    67,242.80x = 2,067,433,850.70
  5. Step 5: Solve for x
    x = 2,067,433,850.70/67,242.80
  6. Step 6: Final answer
    x = 30,745.80

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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.