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Finding the Third Proportional to 3,998 and 7,130

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Solution

The third proportional to 3,998 and 7,130 is: 12,715.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,998 : 7,130 = 7,130 : x
  2. Step 2: Convert to fraction form
    3,998/7,130 = 7,130/x
  3. Step 3: Cross multiply
    3,998x = 7,130 × 7,130
  4. Step 4: Simplify right side
    3,998x = 50,836,900
  5. Step 5: Solve for x
    x = 50,836,900/3,998
  6. Step 6: Final answer
    x = 12,715.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.