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Finding the Third Proportional to 3,990 and 4,350

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Solution

The third proportional to 3,990 and 4,350 is: 4,742.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990 : 4,350 = 4,350 : x
  2. Step 2: Convert to fraction form
    3,990/4,350 = 4,350/x
  3. Step 3: Cross multiply
    3,990x = 4,350 × 4,350
  4. Step 4: Simplify right side
    3,990x = 18,922,500
  5. Step 5: Solve for x
    x = 18,922,500/3,990
  6. Step 6: Final answer
    x = 4,742.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.