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Finding the Fourth Proportional to 399,391.96, 551,157.27 and 218,103.33

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Solution

The fourth proportional to 399,391.96, 551,157.27 and 218,103.33 is: 300,980.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,391.96 : 551,157.27 = 218,103.33 : x
  2. Step 2: Convert to fraction form
    399,391.96/551,157.27 = 218,103.33/x
  3. Step 3: Cross multiply
    399,391.96x = 551,157.27 × 218,103.33
  4. Step 4: Simplify right side
    399,391.96x = 120,209,234,850.19
  5. Step 5: Solve for x
    x = 120,209,234,850.19/399,391.96
  6. Step 6: Final answer
    x = 300,980.61

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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.