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Finding the Fourth Proportional to 2,643.40, 3,965.78 and 794.44

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Solution

The fourth proportional to 2,643.40, 3,965.78 and 794.44 is: 1,191.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,643.40 : 3,965.78 = 794.44 : x
  2. Step 2: Convert to fraction form
    2,643.40/3,965.78 = 794.44/x
  3. Step 3: Cross multiply
    2,643.40x = 3,965.78 × 794.44
  4. Step 4: Simplify right side
    2,643.40x = 3,150,574.26
  5. Step 5: Solve for x
    x = 3,150,574.26/2,643.40
  6. Step 6: Final answer
    x = 1,191.86

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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.