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Finding the Fourth Proportional to 2,651.57, 3,979.17 and 920.19

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Solution

The fourth proportional to 2,651.57, 3,979.17 and 920.19 is: 1,380.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,651.57 : 3,979.17 = 920.19 : x
  2. Step 2: Convert to fraction form
    2,651.57/3,979.17 = 920.19/x
  3. Step 3: Cross multiply
    2,651.57x = 3,979.17 × 920.19
  4. Step 4: Simplify right side
    2,651.57x = 3,661,592.44
  5. Step 5: Solve for x
    x = 3,661,592.44/2,651.57
  6. Step 6: Final answer
    x = 1,380.92

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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.