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Finding the Third Proportional to 5,115 and 8,136

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Solution

The third proportional to 5,115 and 8,136 is: 12,941.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,115 : 8,136 = 8,136 : x
  2. Step 2: Convert to fraction form
    5,115/8,136 = 8,136/x
  3. Step 3: Cross multiply
    5,115x = 8,136 × 8,136
  4. Step 4: Simplify right side
    5,115x = 66,194,496
  5. Step 5: Solve for x
    x = 66,194,496/5,115
  6. Step 6: Final answer
    x = 12,941.25

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.