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Finding the Third Proportional to 85.36 and 128.95

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Solution

The third proportional to 85.36 and 128.95 is: 194.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.36 : 128.95 = 128.95 : x
  2. Step 2: Convert to fraction form
    85.36/128.95 = 128.95/x
  3. Step 3: Cross multiply
    85.36x = 128.95 × 128.95
  4. Step 4: Simplify right side
    85.36x = 16,628.91
  5. Step 5: Solve for x
    x = 16,628.91/85.36
  6. Step 6: Final answer
    x = 194.81

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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.