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Finding the Third Proportional to 76.50 and 115.50

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Solution

The third proportional to 76.50 and 115.50 is: 174.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.50 : 115.50 = 115.50 : x
  2. Step 2: Convert to fraction form
    76.50/115.50 = 115.50/x
  3. Step 3: Cross multiply
    76.50x = 115.50 × 115.50
  4. Step 4: Simplify right side
    76.50x = 13,340.25
  5. Step 5: Solve for x
    x = 13,340.25/76.50
  6. Step 6: Final answer
    x = 174.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.