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Finding the Fourth Proportional to 391,806.40, 587,709.60 and 251,723.20

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Solution

The fourth proportional to 391,806.40, 587,709.60 and 251,723.20 is: 377,584.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,806.40 : 587,709.60 = 251,723.20 : x
  2. Step 2: Convert to fraction form
    391,806.40/587,709.60 = 251,723.20/x
  3. Step 3: Cross multiply
    391,806.40x = 587,709.60 × 251,723.20
  4. Step 4: Simplify right side
    391,806.40x = 147,940,141,182.72
  5. Step 5: Solve for x
    x = 147,940,141,182.72/391,806.40
  6. Step 6: Final answer
    x = 377,584.80

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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.