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Finding the Fourth Proportional to 399,448.86, 551,236.59 and 218,160.78

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Solution

The fourth proportional to 399,448.86, 551,236.59 and 218,160.78 is: 301,060.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,448.86 : 551,236.59 = 218,160.78 : x
  2. Step 2: Convert to fraction form
    399,448.86/551,236.59 = 218,160.78/x
  3. Step 3: Cross multiply
    399,448.86x = 551,236.59 × 218,160.78
  4. Step 4: Simplify right side
    399,448.86x = 120,258,204,438.94
  5. Step 5: Solve for x
    x = 120,258,204,438.94/399,448.86
  6. Step 6: Final answer
    x = 301,060.33

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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.