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Finding the Third Proportional to 74.38 and 85.75

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Solution

The third proportional to 74.38 and 85.75 is: 98.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.38 : 85.75 = 85.75 : x
  2. Step 2: Convert to fraction form
    74.38/85.75 = 85.75/x
  3. Step 3: Cross multiply
    74.38x = 85.75 × 85.75
  4. Step 4: Simplify right side
    74.38x = 7,353.06
  5. Step 5: Solve for x
    x = 7,353.06/74.38
  6. Step 6: Final answer
    x = 98.86

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.