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Finding the Fourth Proportional to 101.86, 140.75 and 80.20

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Solution

The fourth proportional to 101.86, 140.75 and 80.20 is: 110.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.86 : 140.75 = 80.20 : x
  2. Step 2: Convert to fraction form
    101.86/140.75 = 80.20/x
  3. Step 3: Cross multiply
    101.86x = 140.75 × 80.20
  4. Step 4: Simplify right side
    101.86x = 11,288.15
  5. Step 5: Solve for x
    x = 11,288.15/101.86
  6. Step 6: Final answer
    x = 110.82

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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.