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Finding the Fourth Proportional to 3,578.28, 5,367.18 and 981

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Solution

The fourth proportional to 3,578.28, 5,367.18 and 981 is: 1,471.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,578.28 : 5,367.18 = 981 : x
  2. Step 2: Convert to fraction form
    3,578.28/5,367.18 = 981/x
  3. Step 3: Cross multiply
    3,578.28x = 5,367.18 × 981
  4. Step 4: Simplify right side
    3,578.28x = 5,265,203.58
  5. Step 5: Solve for x
    x = 5,265,203.58/3,578.28
  6. Step 6: Final answer
    x = 1,471.43

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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.