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Finding the Third Proportional to 921.38 and 1,987.03

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Solution

The third proportional to 921.38 and 1,987.03 is: 4,285.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.38 : 1,987.03 = 1,987.03 : x
  2. Step 2: Convert to fraction form
    921.38/1,987.03 = 1,987.03/x
  3. Step 3: Cross multiply
    921.38x = 1,987.03 × 1,987.03
  4. Step 4: Simplify right side
    921.38x = 3,948,293.19
  5. Step 5: Solve for x
    x = 3,948,293.19/921.38
  6. Step 6: Final answer
    x = 4,285.22

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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.