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Finding the Third Proportional to 438 and 1,108

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Solution

The third proportional to 438 and 1,108 is: 2,802.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    438 : 1,108 = 1,108 : x
  2. Step 2: Convert to fraction form
    438/1,108 = 1,108/x
  3. Step 3: Cross multiply
    438x = 1,108 × 1,108
  4. Step 4: Simplify right side
    438x = 1,227,664
  5. Step 5: Solve for x
    x = 1,227,664/438
  6. Step 6: Final answer
    x = 2,802.89

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Why These Related Problems?

These problems maintain the same ratio (2.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.