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Finding the Fourth Proportional to 391,990.38, 587,930.23 and 125,716.33

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Solution

The fourth proportional to 391,990.38, 587,930.23 and 125,716.33 is: 188,556.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,990.38 : 587,930.23 = 125,716.33 : x
  2. Step 2: Convert to fraction form
    391,990.38/587,930.23 = 125,716.33/x
  3. Step 3: Cross multiply
    391,990.38x = 587,930.23 × 125,716.33
  4. Step 4: Simplify right side
    391,990.38x = 73,912,430,811.66
  5. Step 5: Solve for x
    x = 73,912,430,811.66/391,990.38
  6. Step 6: Final answer
    x = 188,556.75

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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.