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Finding the Third Proportional to 77 and 109.50

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Solution

The third proportional to 77 and 109.50 is: 155.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    77 : 109.50 = 109.50 : x
  2. Step 2: Convert to fraction form
    77/109.50 = 109.50/x
  3. Step 3: Cross multiply
    77x = 109.50 × 109.50
  4. Step 4: Simplify right side
    77x = 11,990.25
  5. Step 5: Solve for x
    x = 11,990.25/77
  6. Step 6: Final answer
    x = 155.72

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.