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Finding the Third Proportional to 3,515 and 4,155

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Solution

The third proportional to 3,515 and 4,155 is: 4,911.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,515 : 4,155 = 4,155 : x
  2. Step 2: Convert to fraction form
    3,515/4,155 = 4,155/x
  3. Step 3: Cross multiply
    3,515x = 4,155 × 4,155
  4. Step 4: Simplify right side
    3,515x = 17,264,025
  5. Step 5: Solve for x
    x = 17,264,025/3,515
  6. Step 6: Final answer
    x = 4,911.53

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.