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Finding the Fourth Proportional to 3,978.49, 5,965.70 and 1,511.43

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Solution

The fourth proportional to 3,978.49, 5,965.70 and 1,511.43 is: 2,266.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.49 : 5,965.70 = 1,511.43 : x
  2. Step 2: Convert to fraction form
    3,978.49/5,965.70 = 1,511.43/x
  3. Step 3: Cross multiply
    3,978.49x = 5,965.70 × 1,511.43
  4. Step 4: Simplify right side
    3,978.49x = 9,016,737.95
  5. Step 5: Solve for x
    x = 9,016,737.95/3,978.49
  6. Step 6: Final answer
    x = 2,266.37

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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.