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Finding the Fourth Proportional to 53,965.20, 80,909.40 and 20,672.40

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Solution

The fourth proportional to 53,965.20, 80,909.40 and 20,672.40 is: 30,993.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,965.20 : 80,909.40 = 20,672.40 : x
  2. Step 2: Convert to fraction form
    53,965.20/80,909.40 = 20,672.40/x
  3. Step 3: Cross multiply
    53,965.20x = 80,909.40 × 20,672.40
  4. Step 4: Simplify right side
    53,965.20x = 1,672,591,480.56
  5. Step 5: Solve for x
    x = 1,672,591,480.56/53,965.20
  6. Step 6: Final answer
    x = 30,993.89

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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.