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Finding the Fourth Proportional to 393,906.15, 542,936.99 and 279,037.35

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Solution

The fourth proportional to 393,906.15, 542,936.99 and 279,037.35 is: 384,608.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,906.15 : 542,936.99 = 279,037.35 : x
  2. Step 2: Convert to fraction form
    393,906.15/542,936.99 = 279,037.35/x
  3. Step 3: Cross multiply
    393,906.15x = 542,936.99 × 279,037.35
  4. Step 4: Simplify right side
    393,906.15x = 151,499,699,604.17
  5. Step 5: Solve for x
    x = 151,499,699,604.17/393,906.15
  6. Step 6: Final answer
    x = 384,608.62

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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.