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Finding the Fourth Proportional to 391,578.45, 587,080.39 and 125,185.65

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Solution

The fourth proportional to 391,578.45, 587,080.39 and 125,185.65 is: 187,686.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,578.45 : 587,080.39 = 125,185.65 : x
  2. Step 2: Convert to fraction form
    391,578.45/587,080.39 = 125,185.65/x
  3. Step 3: Cross multiply
    391,578.45x = 587,080.39 × 125,185.65
  4. Step 4: Simplify right side
    391,578.45x = 73,494,040,224.40
  5. Step 5: Solve for x
    x = 73,494,040,224.40/391,578.45
  6. Step 6: Final answer
    x = 187,686.63

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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.