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Finding the Fourth Proportional to 94.14, 140.75 and 79.86

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Solution

The fourth proportional to 94.14, 140.75 and 79.86 is: 119.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.14 : 140.75 = 79.86 : x
  2. Step 2: Convert to fraction form
    94.14/140.75 = 79.86/x
  3. Step 3: Cross multiply
    94.14x = 140.75 × 79.86
  4. Step 4: Simplify right side
    94.14x = 11,239.31
  5. Step 5: Solve for x
    x = 11,239.31/94.14
  6. Step 6: Final answer
    x = 119.39

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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.