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Finding the Fourth Proportional to 3,890.87, 5,836.25 and 969.20

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Solution

The fourth proportional to 3,890.87, 5,836.25 and 969.20 is: 1,453.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890.87 : 5,836.25 = 969.20 : x
  2. Step 2: Convert to fraction form
    3,890.87/5,836.25 = 969.20/x
  3. Step 3: Cross multiply
    3,890.87x = 5,836.25 × 969.20
  4. Step 4: Simplify right side
    3,890.87x = 5,656,459.47
  5. Step 5: Solve for x
    x = 5,656,459.47/3,890.87
  6. Step 6: Final answer
    x = 1,453.78

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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.