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Finding the Third Proportional to 80 and 105.50

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Solution

The third proportional to 80 and 105.50 is: 139.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    80 : 105.50 = 105.50 : x
  2. Step 2: Convert to fraction form
    80/105.50 = 105.50/x
  3. Step 3: Cross multiply
    80x = 105.50 × 105.50
  4. Step 4: Simplify right side
    80x = 11,130.25
  5. Step 5: Solve for x
    x = 11,130.25/80
  6. Step 6: Final answer
    x = 139.13

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.