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Finding the Fourth Proportional to 391,999.40, 587,999.10 and 205,375.40

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Solution

The fourth proportional to 391,999.40, 587,999.10 and 205,375.40 is: 308,063.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,999.40 : 587,999.10 = 205,375.40 : x
  2. Step 2: Convert to fraction form
    391,999.40/587,999.10 = 205,375.40/x
  3. Step 3: Cross multiply
    391,999.40x = 587,999.10 × 205,375.40
  4. Step 4: Simplify right side
    391,999.40x = 120,760,550,362.14
  5. Step 5: Solve for x
    x = 120,760,550,362.14/391,999.40
  6. Step 6: Final answer
    x = 308,063.10

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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.