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Finding the Third Proportional to 1,515 and 3,390

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Solution

The third proportional to 1,515 and 3,390 is: 7,585.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515 : 3,390 = 3,390 : x
  2. Step 2: Convert to fraction form
    1,515/3,390 = 3,390/x
  3. Step 3: Cross multiply
    1,515x = 3,390 × 3,390
  4. Step 4: Simplify right side
    1,515x = 11,492,100
  5. Step 5: Solve for x
    x = 11,492,100/1,515
  6. Step 6: Final answer
    x = 7,585.54

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Why These Related Problems?

These problems maintain the same ratio (2.24) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.