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Finding the Third Proportional to 120.25 and 135.50

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Solution

The third proportional to 120.25 and 135.50 is: 152.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.25 : 135.50 = 135.50 : x
  2. Step 2: Convert to fraction form
    120.25/135.50 = 135.50/x
  3. Step 3: Cross multiply
    120.25x = 135.50 × 135.50
  4. Step 4: Simplify right side
    120.25x = 18,360.25
  5. Step 5: Solve for x
    x = 18,360.25/120.25
  6. Step 6: Final answer
    x = 152.68

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Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.