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Finding the Fourth Proportional to 1,905.05, 2,857.74 and 518.39

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Solution

The fourth proportional to 1,905.05, 2,857.74 and 518.39 is: 777.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.05 : 2,857.74 = 518.39 : x
  2. Step 2: Convert to fraction form
    1,905.05/2,857.74 = 518.39/x
  3. Step 3: Cross multiply
    1,905.05x = 2,857.74 × 518.39
  4. Step 4: Simplify right side
    1,905.05x = 1,481,409.55
  5. Step 5: Solve for x
    x = 1,481,409.55/1,905.05
  6. Step 6: Final answer
    x = 777.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.