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Finding the Fourth Proportional to 2,650.67, 3,976.01 and 919.30

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Solution

The fourth proportional to 2,650.67, 3,976.01 and 919.30 is: 1,378.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,650.67 : 3,976.01 = 919.30 : x
  2. Step 2: Convert to fraction form
    2,650.67/3,976.01 = 919.30/x
  3. Step 3: Cross multiply
    2,650.67x = 3,976.01 × 919.30
  4. Step 4: Simplify right side
    2,650.67x = 3,655,145.99
  5. Step 5: Solve for x
    x = 3,655,145.99/2,650.67
  6. Step 6: Final answer
    x = 1,378.95

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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.