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Finding the Fourth Proportional to 85.28, 127.92 and 76.36

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Solution

The fourth proportional to 85.28, 127.92 and 76.36 is: 114.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.28 : 127.92 = 76.36 : x
  2. Step 2: Convert to fraction form
    85.28/127.92 = 76.36/x
  3. Step 3: Cross multiply
    85.28x = 127.92 × 76.36
  4. Step 4: Simplify right side
    85.28x = 9,767.97
  5. Step 5: Solve for x
    x = 9,767.97/85.28
  6. Step 6: Final answer
    x = 114.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.