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Finding the Fourth Proportional to 1,939, 2,676.36 and 1,318

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Solution

The fourth proportional to 1,939, 2,676.36 and 1,318 is: 1,819.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939 : 2,676.36 = 1,318 : x
  2. Step 2: Convert to fraction form
    1,939/2,676.36 = 1,318/x
  3. Step 3: Cross multiply
    1,939x = 2,676.36 × 1,318
  4. Step 4: Simplify right side
    1,939x = 3,527,442.48
  5. Step 5: Solve for x
    x = 3,527,442.48/1,939
  6. Step 6: Final answer
    x = 1,819.21

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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.