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Finding the Third Proportional to 1,089.70 and 2,331.28

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Solution

The third proportional to 1,089.70 and 2,331.28 is: 4,987.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.70 : 2,331.28 = 2,331.28 : x
  2. Step 2: Convert to fraction form
    1,089.70/2,331.28 = 2,331.28/x
  3. Step 3: Cross multiply
    1,089.70x = 2,331.28 × 2,331.28
  4. Step 4: Simplify right side
    1,089.70x = 5,434,872.27
  5. Step 5: Solve for x
    x = 5,434,872.27/1,089.70
  6. Step 6: Final answer
    x = 4,987.48

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.