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Finding the Fourth Proportional to 94.05, 140.79 and 85.35

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Solution

The fourth proportional to 94.05, 140.79 and 85.35 is: 127.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.05 : 140.79 = 85.35 : x
  2. Step 2: Convert to fraction form
    94.05/140.79 = 85.35/x
  3. Step 3: Cross multiply
    94.05x = 140.79 × 85.35
  4. Step 4: Simplify right side
    94.05x = 12,016.43
  5. Step 5: Solve for x
    x = 12,016.43/94.05
  6. Step 6: Final answer
    x = 127.77

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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.