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Finding the Fourth Proportional to 140.81, 194.31 and 85.55

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Solution

The fourth proportional to 140.81, 194.31 and 85.55 is: 118.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.81 : 194.31 = 85.55 : x
  2. Step 2: Convert to fraction form
    140.81/194.31 = 85.55/x
  3. Step 3: Cross multiply
    140.81x = 194.31 × 85.55
  4. Step 4: Simplify right side
    140.81x = 16,622.25
  5. Step 5: Solve for x
    x = 16,622.25/140.81
  6. Step 6: Final answer
    x = 118.05

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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.