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Finding the Fourth Proportional to 140.75, 193.89 and 117.43

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Solution

The fourth proportional to 140.75, 193.89 and 117.43 is: 161.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.75 : 193.89 = 117.43 : x
  2. Step 2: Convert to fraction form
    140.75/193.89 = 117.43/x
  3. Step 3: Cross multiply
    140.75x = 193.89 × 117.43
  4. Step 4: Simplify right side
    140.75x = 22,768.89
  5. Step 5: Solve for x
    x = 22,768.89/140.75
  6. Step 6: Final answer
    x = 161.76

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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.