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Finding the Third Proportional to 2,158 and 3,315

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Solution

The third proportional to 2,158 and 3,315 is: 5,092.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158 : 3,315 = 3,315 : x
  2. Step 2: Convert to fraction form
    2,158/3,315 = 3,315/x
  3. Step 3: Cross multiply
    2,158x = 3,315 × 3,315
  4. Step 4: Simplify right side
    2,158x = 10,989,225
  5. Step 5: Solve for x
    x = 10,989,225/2,158
  6. Step 6: Final answer
    x = 5,092.32

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.