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Finding the Fourth Proportional to 3,891.54, 5,372.28 and 2,639.19

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Solution

The fourth proportional to 3,891.54, 5,372.28 and 2,639.19 is: 3,643.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.54 : 5,372.28 = 2,639.19 : x
  2. Step 2: Convert to fraction form
    3,891.54/5,372.28 = 2,639.19/x
  3. Step 3: Cross multiply
    3,891.54x = 5,372.28 × 2,639.19
  4. Step 4: Simplify right side
    3,891.54x = 14,178,467.65
  5. Step 5: Solve for x
    x = 14,178,467.65/3,891.54
  6. Step 6: Final answer
    x = 3,643.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.