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Finding the Third Proportional to 920 and 1,987

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Solution

The third proportional to 920 and 1,987 is: 4,291.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    920 : 1,987 = 1,987 : x
  2. Step 2: Convert to fraction form
    920/1,987 = 1,987/x
  3. Step 3: Cross multiply
    920x = 1,987 × 1,987
  4. Step 4: Simplify right side
    920x = 3,948,169
  5. Step 5: Solve for x
    x = 3,948,169/920
  6. Step 6: Final answer
    x = 4,291.49

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.