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Finding the Fourth Proportional to 140.93, 194.49 and 85.66

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Solution

The fourth proportional to 140.93, 194.49 and 85.66 is: 118.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.93 : 194.49 = 85.66 : x
  2. Step 2: Convert to fraction form
    140.93/194.49 = 85.66/x
  3. Step 3: Cross multiply
    140.93x = 194.49 × 85.66
  4. Step 4: Simplify right side
    140.93x = 16,659.53
  5. Step 5: Solve for x
    x = 16,659.53/140.93
  6. Step 6: Final answer
    x = 118.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.