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Finding the Third Proportional to 3,987 and 8,430

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Solution

The third proportional to 3,987 and 8,430 is: 17,824.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987 : 8,430 = 8,430 : x
  2. Step 2: Convert to fraction form
    3,987/8,430 = 8,430/x
  3. Step 3: Cross multiply
    3,987x = 8,430 × 8,430
  4. Step 4: Simplify right side
    3,987x = 71,064,900
  5. Step 5: Solve for x
    x = 71,064,900/3,987
  6. Step 6: Final answer
    x = 17,824.15

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.