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Finding the Fourth Proportional to 391,571.19, 587,619.25 and 251,428.23

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Solution

The fourth proportional to 391,571.19, 587,619.25 and 251,428.23 is: 377,310.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,571.19 : 587,619.25 = 251,428.23 : x
  2. Step 2: Convert to fraction form
    391,571.19/587,619.25 = 251,428.23/x
  3. Step 3: Cross multiply
    391,571.19x = 587,619.25 × 251,428.23
  4. Step 4: Simplify right side
    391,571.19x = 147,744,067,312.86
  5. Step 5: Solve for x
    x = 147,744,067,312.86/391,571.19
  6. Step 6: Final answer
    x = 377,310.87

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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.