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Finding the Third Proportional to 84 and 135.75

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Solution

The third proportional to 84 and 135.75 is: 219.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    84 : 135.75 = 135.75 : x
  2. Step 2: Convert to fraction form
    84/135.75 = 135.75/x
  3. Step 3: Cross multiply
    84x = 135.75 × 135.75
  4. Step 4: Simplify right side
    84x = 18,428.06
  5. Step 5: Solve for x
    x = 18,428.06/84
  6. Step 6: Final answer
    x = 219.38

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Why These Related Problems?

These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.