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Finding the Fourth Proportional to 94.88, 142.09 and 85.76

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Solution

The fourth proportional to 94.88, 142.09 and 85.76 is: 128.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.88 : 142.09 = 85.76 : x
  2. Step 2: Convert to fraction form
    94.88/142.09 = 85.76/x
  3. Step 3: Cross multiply
    94.88x = 142.09 × 85.76
  4. Step 4: Simplify right side
    94.88x = 12,185.64
  5. Step 5: Solve for x
    x = 12,185.64/94.88
  6. Step 6: Final answer
    x = 128.43

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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.