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Finding the Fourth Proportional to 399,211.21, 550,912.55 and 217,923.29

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Solution

The fourth proportional to 399,211.21, 550,912.55 and 217,923.29 is: 300,734.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,211.21 : 550,912.55 = 217,923.29 : x
  2. Step 2: Convert to fraction form
    399,211.21/550,912.55 = 217,923.29/x
  3. Step 3: Cross multiply
    399,211.21x = 550,912.55 × 217,923.29
  4. Step 4: Simplify right side
    399,211.21x = 120,056,675,398.29
  5. Step 5: Solve for x
    x = 120,056,675,398.29/399,211.21
  6. Step 6: Final answer
    x = 300,734.73

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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.