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Finding the Fourth Proportional to 394,094.36, 543,791.38 and 221,987.72

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Solution

The fourth proportional to 394,094.36, 543,791.38 and 221,987.72 is: 306,309.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,094.36 : 543,791.38 = 221,987.72 : x
  2. Step 2: Convert to fraction form
    394,094.36/543,791.38 = 221,987.72/x
  3. Step 3: Cross multiply
    394,094.36x = 543,791.38 × 221,987.72
  4. Step 4: Simplify right side
    394,094.36x = 120,715,008,601.85
  5. Step 5: Solve for x
    x = 120,715,008,601.85/394,094.36
  6. Step 6: Final answer
    x = 306,309.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.