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Finding the Fourth Proportional to 85.89, 128.88 and 40.27

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Solution

The fourth proportional to 85.89, 128.88 and 40.27 is: 60.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.89 : 128.88 = 40.27 : x
  2. Step 2: Convert to fraction form
    85.89/128.88 = 40.27/x
  3. Step 3: Cross multiply
    85.89x = 128.88 × 40.27
  4. Step 4: Simplify right side
    85.89x = 5,190.00
  5. Step 5: Solve for x
    x = 5,190.00/85.89
  6. Step 6: Final answer
    x = 60.43

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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.