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Finding the Third Proportional to 1,086 and 2,390

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Solution

The third proportional to 1,086 and 2,390 is: 5,259.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086 : 2,390 = 2,390 : x
  2. Step 2: Convert to fraction form
    1,086/2,390 = 2,390/x
  3. Step 3: Cross multiply
    1,086x = 2,390 × 2,390
  4. Step 4: Simplify right side
    1,086x = 5,712,100
  5. Step 5: Solve for x
    x = 5,712,100/1,086
  6. Step 6: Final answer
    x = 5,259.76

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.