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Finding the Third Proportional to 77.50 and 115.50

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Solution

The third proportional to 77.50 and 115.50 is: 172.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.50 : 115.50 = 115.50 : x
  2. Step 2: Convert to fraction form
    77.50/115.50 = 115.50/x
  3. Step 3: Cross multiply
    77.50x = 115.50 × 115.50
  4. Step 4: Simplify right side
    77.50x = 13,340.25
  5. Step 5: Solve for x
    x = 13,340.25/77.50
  6. Step 6: Final answer
    x = 172.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.