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Finding the Fourth Proportional to 71,578.15, 107,359.02 and 18,991.73

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Solution

The fourth proportional to 71,578.15, 107,359.02 and 18,991.73 is: 28,485.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,578.15 : 107,359.02 = 18,991.73 : x
  2. Step 2: Convert to fraction form
    71,578.15/107,359.02 = 18,991.73/x
  3. Step 3: Cross multiply
    71,578.15x = 107,359.02 × 18,991.73
  4. Step 4: Simplify right side
    71,578.15x = 2,038,933,789.30
  5. Step 5: Solve for x
    x = 2,038,933,789.30/71,578.15
  6. Step 6: Final answer
    x = 28,485.42

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1.5x scale

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.