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Finding the Fourth Proportional to 3,390.72, 4,679.64 and 1,993.44

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Solution

The fourth proportional to 3,390.72, 4,679.64 and 1,993.44 is: 2,751.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390.72 : 4,679.64 = 1,993.44 : x
  2. Step 2: Convert to fraction form
    3,390.72/4,679.64 = 1,993.44/x
  3. Step 3: Cross multiply
    3,390.72x = 4,679.64 × 1,993.44
  4. Step 4: Simplify right side
    3,390.72x = 9,328,581.56
  5. Step 5: Solve for x
    x = 9,328,581.56/3,390.72
  6. Step 6: Final answer
    x = 2,751.21

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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.