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Finding the Third Proportional to 1,515 and 1,920

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Solution

The third proportional to 1,515 and 1,920 is: 2,433.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515 : 1,920 = 1,920 : x
  2. Step 2: Convert to fraction form
    1,515/1,920 = 1,920/x
  3. Step 3: Cross multiply
    1,515x = 1,920 × 1,920
  4. Step 4: Simplify right side
    1,515x = 3,686,400
  5. Step 5: Solve for x
    x = 3,686,400/1,515
  6. Step 6: Final answer
    x = 2,433.27

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.