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Finding the Fourth Proportional to 2,650.92, 3,976.39 and 919.55

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Solution

The fourth proportional to 2,650.92, 3,976.39 and 919.55 is: 1,379.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,650.92 : 3,976.39 = 919.55 : x
  2. Step 2: Convert to fraction form
    2,650.92/3,976.39 = 919.55/x
  3. Step 3: Cross multiply
    2,650.92x = 3,976.39 × 919.55
  4. Step 4: Simplify right side
    2,650.92x = 3,656,489.42
  5. Step 5: Solve for x
    x = 3,656,489.42/2,650.92
  6. Step 6: Final answer
    x = 1,379.33

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Half scale
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Double scale
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Similar ratio
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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.