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Finding the Fourth Proportional to 3,891.32, 5,828.40 and 3,216.55

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Solution

The fourth proportional to 3,891.32, 5,828.40 and 3,216.55 is: 4,817.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.32 : 5,828.40 = 3,216.55 : x
  2. Step 2: Convert to fraction form
    3,891.32/5,828.40 = 3,216.55/x
  3. Step 3: Cross multiply
    3,891.32x = 5,828.40 × 3,216.55
  4. Step 4: Simplify right side
    3,891.32x = 18,747,340.02
  5. Step 5: Solve for x
    x = 18,747,340.02/3,891.32
  6. Step 6: Final answer
    x = 4,817.73

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1.5x scale

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.