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Finding the Fourth Proportional to 3,890.90, 5,836.38 and 969.21

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Solution

The fourth proportional to 3,890.90, 5,836.38 and 969.21 is: 1,453.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.90 : 5,836.38 = 969.21 : x
  2. Step 2: Convert to fraction form
    3,890.90/5,836.38 = 969.21/x
  3. Step 3: Cross multiply
    3,890.90x = 5,836.38 × 969.21
  4. Step 4: Simplify right side
    3,890.90x = 5,656,660.54
  5. Step 5: Solve for x
    x = 5,656,660.54/3,890.90
  6. Step 6: Final answer
    x = 1,453.82

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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.