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Finding the Third Proportional to 120.75 and 145.50

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Solution

The third proportional to 120.75 and 145.50 is: 175.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.75 : 145.50 = 145.50 : x
  2. Step 2: Convert to fraction form
    120.75/145.50 = 145.50/x
  3. Step 3: Cross multiply
    120.75x = 145.50 × 145.50
  4. Step 4: Simplify right side
    120.75x = 21,170.25
  5. Step 5: Solve for x
    x = 21,170.25/120.75
  6. Step 6: Final answer
    x = 175.32

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Why These Related Problems?

These problems maintain the same ratio (1.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.