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Finding the Fourth Proportional to 85.24, 128.03 and 82.85

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Solution

The fourth proportional to 85.24, 128.03 and 82.85 is: 124.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.24 : 128.03 = 82.85 : x
  2. Step 2: Convert to fraction form
    85.24/128.03 = 82.85/x
  3. Step 3: Cross multiply
    85.24x = 128.03 × 82.85
  4. Step 4: Simplify right side
    85.24x = 10,606.23
  5. Step 5: Solve for x
    x = 10,606.23/85.24
  6. Step 6: Final answer
    x = 124.43

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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.