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Finding the Fourth Proportional to 40,690.20, 60,986.70 and 20,958.60

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Solution

The fourth proportional to 40,690.20, 60,986.70 and 20,958.60 is: 31,412.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,690.20 : 60,986.70 = 20,958.60 : x
  2. Step 2: Convert to fraction form
    40,690.20/60,986.70 = 20,958.60/x
  3. Step 3: Cross multiply
    40,690.20x = 60,986.70 × 20,958.60
  4. Step 4: Simplify right side
    40,690.20x = 1,278,195,850.62
  5. Step 5: Solve for x
    x = 1,278,195,850.62/40,690.20
  6. Step 6: Final answer
    x = 31,412.87

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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.