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Finding the Fourth Proportional to 101.75, 140.31 and 66.80

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Solution

The fourth proportional to 101.75, 140.31 and 66.80 is: 92.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.75 : 140.31 = 66.80 : x
  2. Step 2: Convert to fraction form
    101.75/140.31 = 66.80/x
  3. Step 3: Cross multiply
    101.75x = 140.31 × 66.80
  4. Step 4: Simplify right side
    101.75x = 9,372.27
  5. Step 5: Solve for x
    x = 9,372.27/101.75
  6. Step 6: Final answer
    x = 92.12

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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.